CommonersFramework.nlogo

; Developed by Dr Peter Barbrook-Johnson and Antonio Tenorio-Fornés

; Comments welcome - emails: p.barbrook-johnson@psi.org.uk, antoniotenorio@ucm.es

extensions [ nw ]



globals [

  initial-products ;; number of initial products
  contrib-distrib ;; Sorted list of contributions per commoner
  dead-commoners-contribs ;; Sorted list of contributions per dead commoner
  ticks-without-projects ;; ticks without projects in the model; used for a stop condition
  gini-index-reserve ;; gini-index
  power-law-pvalue ;; power law p-value
  power-law-xmin ;; power law xmin parameter
  power-law-alpha ;; power law alpha parameter

  withR ;;
]

__includes["withRextension.nls"]
;__includes["withoutRextension.nls"]

breed [commoners commoner] ;; The agents representing individuals interacting (consuming/producing) in the community
breed [products product] ;; The common goods being produced and used in the community
breed [projects project] ;; The main organization of production work in the community (contains tasks)
breed [t4sks t4sk] ;; Individual units of productive work done in the projects of the community

undirected-link-breed [projecttasklinks projecttasklink] ;; represents the project-task relationships; each task belongs to a project
directed-link-breed [commonertasklinks commonertasklink] ;; represents that a task is known by a commoner; its recent-weight (a link parameter) represents the memory of recent contribution of the commoner to that task
undirected-link-breed [commonerprojectlinks commonerprojectlink] ;; represents that an commoner is aware of a project; recent-weight (a link parameter) represents the memory of recent contributions to that project;
undirected-link-breed [friendlinks friendlink] ;; represents relationships among agents that have worked in the same tasks and become "friends".
directed-link-breed [consumerlinks consumerlink] ;; represents a consumption relationhip between a commoner and a product
undirected-link-breed [projectproductlinks projectproductlink] ;; represents to which product the efforts in a project goes.

turtles-own [
  repulsion ;; all agents are naturally pulled away from the center (while they are pushed towards the center when they are active) to represent the natural atrophy of a community. This parameter is used to tune the speed of this process.
]

links-own [

  total-weight ;; record of the number of interactions of the interaction the link represents
  recent-weight ;; the memory of recent activity from between two entities (e.g. Contributions between a commoner and a task or recent frecuency of collaboration between two friends)
  max-recent-weight ;; A parameter used to cap the recent weight of links.

  forget-recent-weight-prob ;; The chances a unit of recent weight is forgotten
  forget-link-prob ;; The chances a link will die due to lack of recent activity. A link can only die if the recen contribution is 0.

  ;; ATRACTION: activities such as production and consumption brings agents towards the center of the model.
  ;; For instance, contributing to a task will make the task (and its project) become closer to the center
  ;; but also will bring the contributing commoner towards the center. The strength of this pulls is set by
  ;; the following parameters
  target-attraction ;; attraction strength of the target node (e.g. how much a task attracts its contributing agents)
  origin-attraction ;; attraction strength of the origin node (e.g. how much a commoner attracts the tasks it is contributing to)

]

commoners-own [
  skills ;; The skills a commoner have. Tasks also have a skill attribute representing the skills needed to contribute to it. TODO consider to remove it from basic model
  interest ;; a broad representation of the topic/area the commoner is interested in. It affects its vertical position, thus making it easier to find products and projects with similar interests.
  total-contribs ;; the total number of finished contributions
]

projects-own [
  interest ;; a broad representation of the topic/area the project is about. It affects its vertical position,
]

t4sks-own [
  skill ;; The skills needed to contribute to this task. TODO think if keeping it in the basic model
  time-required ;; How many contributions the task needs to be finished
]

products-own [
  interest ;; a broad representation of the topic/area the product is about. It affects its vertical position,
]

to setup

  clear-all

   ;; colour lines to mark projects and products spaces
   ask patches with [pxcor = 0] [set pcolor white]

   create-existing-products
   create-existing-projects
   create-existing-commoners

   set ticks-without-projects 0

   set contrib-distrib [total-contribs] of commoners
   set contrib-distrib sort-by > contrib-distrib

   ;; list of contributions by dead agents
   set dead-commoners-contribs (list)

   r?setup

   reset-ticks
end


to create-existing-products
  ;; create products; set their position and defeault parameters
 set initial-products number-of-products
  create-products initial-products [
    set interest random num-interest-categories
    set xcor -25 + random 25
    set ycor -25 + interest
    set-product-parameters
]

end

to set-product-parameters
  ;; Style
  set size 2
  set color orange
  set shape "box"
  ;;

  set repulsion product-repulsion-prob

end

to create-existing-projects
  ;; create projects; set their position and defeault parameters
  create-projects initial-projects [

    set interest random num-interest-categories

    set-project-parameters

    ;; create a project to product link to the nearest product
    ;; only half of the projects have a product, the others will create a new product once they have finished.

    ;; TODO: change probability depending on initial number of products.
    if random-float 1 < 0.5  [
      let my-product min-one-of products [ distance myself ]
      create-projectproductlink-with my-product [ set-projectproductlink-parameters ]
    ]
  ]
end

to set-project-parameters

    ;; Style
    set size 2.5
    set color green - 2
    set shape "target"
    ;;

    set xcor -25 + (random 25)
    set ycor -25 + interest


    set repulsion project-repulsion-prob

    let num-tasks random 10 + 2

    hatch-t4sks num-tasks [
      set-task-parameters
    ]

end

to set-task-parameters

  ;; style
  set size 0.7
  set color green
  set shape "circle"
  ;;

  ;; position
  set ycor [ycor] of myself
  set heading random 360
  fd 1
  ;;

  ;; link to its project
  create-projecttasklink-with myself [tie]

  t4sk-set-skill

  ;; Number of contribution actions needed to finish the task
  set time-required random-normal mean-time-required ( mean-time-required / 4 )

end

to t4sk-set-skill

  ; new tasks set their skill type
  ; if there are no other task in the project
  ; or with probability 50%
  ifelse (not any? [ projecttasklink-neighbors ] of myself) or (random-float 1 < 0.5) [

    ; set a random skill
    set skill random (num-skills - 1)

  ] [

    ; else, set the task skill equal to one of its project tasks
    set skill [ skill ] of one-of [ projecttasklink-neighbors ] of myself

  ]
end

to create-existing-commoners

  ;; commoners hava a preferential attachement like structure
  print commoners-num
  nw:generate-preferential-attachment commoners friendlinks commoners-num 1 [set color red]

  ;; the majority of the community has not contributed and therefore have no firends in the model
;  ask commoners with [count my-friendlinks = 1] [
;    ask one-of my-friendlinks [
;      die
;    ]
;  ]

  ask commoners [
    set-commoner-parameters
  ]

      ;; The number of friends is considered as a proxy of the commoner contribution activity, thus setting its horizontal position;
  ask commoners [
    let friends count my-friendlinks
    ;; commoners without friends are at the edge of the model (xcor = 25), each extra friend up to 4 brings it 5 units towards the center
    set xcor max (list 1 (25 - friends ^ 2) )
  ]

  ask friendlinks [
    set-friendlink-parameters
  ]


end

to set-commonertasklink-parameters
  set color green
  set hidden? hide-commonertasklinks?
  set max-recent-weight 3
  set forget-recent-weight-prob 1 / contrib-recent-forg
  set forget-link-prob 1 / contrib-long-forg
  set origin-attraction task-commoner-attraction-prob
  set target-attraction commoner-task-attraction-prob
end

to set-consumerlink-parameters
  set color orange
  set hidden? hide-consumerlinks?
  set max-recent-weight 3
  set forget-recent-weight-prob 1 / consume-recent-forg
  set forget-link-prob 1 / consume-long-forg
  set origin-attraction product-commoner-attraction-prob
  set target-attraction commoner-product-attraction-prob
end

to set-commonerprojectlink-parameters
  set color green + 3
  set hidden? hide-commonerprojectlinks?
  set max-recent-weight 3
  set forget-recent-weight-prob 1 / project-recent-forg
  set forget-link-prob 1 / project-long-forg
end

to set-friendlink-parameters
  set color yellow + 3
  set max-recent-weight 3
  set forget-recent-weight-prob 1 / friends-recent-forg
  set forget-link-prob 1 / friends-long-forg
end

to set-projectproductlink-parameters
 set color red
end

to set-commoner-parameters

  ;; style
  set size 1.5
  set color blue


  ;;position and interest
  set interest random num-interest-categories
  set ycor -25 + interest

  set repulsion commoner-repulsion-prob

  ;; commoners consume a community product
  create-consumerlink-to min-one-of products [ distance myself ] [set-consumerlink-parameters]

  ;; 3 random skills per commoner
  set skills (n-of 3 (n-values num-skills [x -> x]))


  let num-friends count my-friendlinks

  ;; An initial project per commoner that have friends...
  ;; ... as having friends is considered as an initial proxy to the contribution activity of the commoner
  if num-friends > 0 [

    ;; Commoners chose projects that contribute to the products they consume
    ;; if there is no projct that contributes to the commoners products, then choose the closest one
    let product-projects turtle-set [ projectproductlink-neighbors ] of out-consumerlink-neighbors

    ifelse any? product-projects [
      create-commonerprojectlink-with min-one-of product-projects [ distance myself ] [set-commonerprojectlink-parameters]
    ] [
      if any? projects [
        create-commonerprojectlink-with min-one-of projects [ distance myself ] [set-commonerprojectlink-parameters]
      ]
    ]
  ]

  let project-tasks (turtle-set [ projecttasklink-neighbors ] of commonerprojectlink-neighbors)
  ;; Make commoner-task connections with an upper bound of the number of friends.
  create-commonertasklinks-to n-of random min (list count project-tasks num-friends) project-tasks [
    set-commonertasklink-parameters
    set recent-weight random min (list 4 num-friends)
  ]

  set total-contribs sum [recent-weight] of my-out-commonertasklinks

end

to go

  ask commoners [

    ;; contribution
    find-project
    find-task
    contribute

    ;; friendship
    find-friends

    ;; consumption
    find-product
    consume

    ;; bring friends
    recommend

    ;; create project
    propose-project

    ;; leave community
    leave

  ]

  product-death

  project-death

  links-decay

  update-positions

  update-contrib-distrib

  ;; Stop conditions
  ;; ... if there are no commoner
  if not any? commoners [ stop ]

  ;; ... if there are no products
    if not any? products [ stop ]

  ;; ... if there is no project for 30 ticks
  ifelse not any? projects [
    set ticks-without-projects ticks-without-projects + 1
  ] [
    set ticks-without-projects 0
  ]

  if ticks-without-projects > 30 [ print "STOP: 30 ticks without projects" stop ]

  ;; Power law fit calculation
  if (withR and power-law-tests?)[
    if not r?is-powerlaw? [print "STOP: It is not plausible that the distribution of work follows a power-law" stop]
  ]

  if ticks >= maxTicks [ print (word "STOP: The model run for the maximum " maxTicks " ticks") stop ]

  if count turtles > maxTurtles [ print (word "STOP: The model reached the maximum " maxTurtles " turtles") stop ]



  tick

end

to update-contrib-distrib
  set contrib-distrib sentence [total-contribs] of commoners dead-commoners-contribs
  set contrib-distrib sort-by > contrib-distrib
end

to update-positions

  ;; each tick, agents update their positions depending on:
  ;;  1) the attraction affecting them from their active links: consumer/commonertask/commonerproject
  attraction-movements
  ;;  2) the repulsion towards the edges of the model representing natural decay of activity/interest
  repulsion-movements

end

to attraction-movements
  ;; Movements of agents toward center
  ;; For each link breed, weighted by number of links and their recent weights
  ask turtles [

    let linkbreeds (list)

    ;; Target attraction movements
    while [any? my-in-links with [ not member? breed linkbreeds ]] [
      ask one-of my-in-links with [ not member? breed linkbreeds ] [
        set linkbreeds lput breed linkbreeds
      ]

      let b last linkbreeds

      if any? my-in-links with [ breed = b and target-attraction > 0] [
        ask one-of my-in-links with [ breed = b and target-attraction > 0] [
          if random-float 1 < count [ my-in-links with [breed = b and recent-weight > 0] ] of myself * recent-weight * target-attraction [
            move-towards-center myself
          ]
        ]
      ]
    ]

    ;; Origin attraction movements
    while [any? my-out-links with [ not member? breed linkbreeds ]] [
      ask one-of my-out-links with [ not member? breed linkbreeds ] [
        set linkbreeds lput breed linkbreeds
      ]

      let b last linkbreeds

      if any? my-out-links with [ breed = b and origin-attraction > 0] [
        ask one-of my-out-links with [ breed = b and origin-attraction > 0] [
          if random-float 1 < count [ my-out-links with [breed = b and recent-weight > 0] ] of myself * recent-weight * origin-attraction [
            move-towards-center myself
          ]
        ]
      ]
    ]
  ]

end

to repulsion-movements
  ;; Movement toward edges of the model.
  ;; Repulsion strength depends on distance to center.
  ask turtles with [random-float 1 < ((25 - abs xcor) * repulsion / 25)] [
    move-towards-edges self
  ]
end

to links-decay
  ask links with [ recent-weight > 0 and random-float 1 < forget-recent-weight-prob ] [
    decrease-weight
  ]

  ask links with [ recent-weight = 0 and random-float 1 < forget-link-prob ] [
    die
  ]

end

to move-towards-edges [ agent ]
  ask agent [
    if xcor < 0 and xcor > -25 [
      ;; 'carefully' needed to prevent tied agents to move outside the model
      ;; for instance, tasks tied to projects
      carefully [ set xcor xcor - 1 ] []
    ]
    if xcor > 0 and xcor < 25 [
      carefully [ set xcor xcor + 1 ] []
    ]
  ]
end

to move-towards-center [ agent ]
  ask agent [
    if xcor < -1 [
      if not any? my-links with [tie-mode = "fixed" and [ xcor ] of other-end >= -1 ] [
        set xcor xcor + 1
      ]
    ]
    if xcor > 1 [
      if not any? my-links with [tie-mode = "fixed" and [ xcor ] of other-end <= 1 ] [
        set xcor xcor - 1
      ]
    ]
  ]
end

;; Link method to increase current weight
to increase-weight

  set total-weight total-weight + 1
  set recent-weight min (list max-recent-weight (recent-weight + 1 ))

  ;; make active links visible
  if hidden? [
     if (breed = commonertasklinks and not hide-commonertasklinks?) [
       set hidden? false
     ]
     if (breed = consumerlinks and not hide-consumerlinks?) [
       set hidden? false
     ]
     if (breed = commonerprojectlinks and not hide-commonerprojectlinks?) [
       set hidden? false
     ]
     if (breed != commonertasklinks and breed != consumerlinks and breed != commonerprojectlinks) [
       set hidden? false
     ]
  ]

end

;; Link method to decrease current weight
to decrease-weight

  set recent-weight max (list 0 (recent-weight - 1 ))
    ;; hide
    if recent-weight = 0 [
      set hidden? true
    ]
end

to-report project-friends
  let me myself
  report count commonerprojectlink-neighbors with [friendlink-neighbor? me]
end

to-report find-project-prob
  let friends-effect project-friends * find-project-friends
  report (min (list max-find-level ((1 + friends-effect) / (1 + distance myself * find-project-dist))))
end

to find-project
  if any? projects with [not member? self commonerprojectlink-neighbors] [
    ask one-of projects with [not member? self commonerprojectlink-neighbors] [
      if random-float 1 < find-project-prob [
        create-commonerprojectlink-with myself [set-commonerprojectlink-parameters]
      ]
    ]
  ]
end

;;
to-report task-friends
  let me myself
  report in-commonertasklink-neighbors with [friendlink-neighbor? me]
end

to-report find-task-prob
  let friends-effect count task-friends * find-task-friends
  report (min (list max-find-level ((1 + friends-effect) / (( 1 + distance myself * find-task-dist)))))
end


to find-task
  let task-of-my-projects
    turtle-set [ projecttasklink-neighbors ] of commonerprojectlink-neighbors

  if any? task-of-my-projects [
    ask one-of task-of-my-projects [
      if random-float 1 < find-task-prob [
        create-commonertasklink-from myself [ set-commonertasklink-parameters ]
      ]
    ]
  ]
end

to-report contrib-prob
  ;; returns the probability of the contribution, depending on total contributions, number of friends, recent contribution
  let tasklinks [ my-out-commonertasklinks ] of myself


  let total-contrib-effect 1 ; + (sqrt ([total-contribs] of myself) * contrib-total-weight)
  let recent-contrib-effect 1 ; (ln (e + sum [recent-weight] of [my-out-commonertasklinks] of myself) * contrib-recent-weight)
  let friend-task-effect 1 ; (ln (e + count task-friends) * contrib-friend-task-effect)
  let total-contrib-to-task-effect 1; + [recent-weight] of in-commonertasklink-from myself

  let skill-effect 1
  ;if (member? skill ([skills] of myself)) [set skill-effect 3]

  let prob 1 / (1 + distance myself * contrib-dist)

  ;;if ([total-weight] of in-commonertasklink-from myself = 0) [
  ;;  set prob min (list 0.02 prob)
  ;;]

  ;; Maxium contribution prob is 0.8
  report min (list 0.8 prob)


end

to-report contrib-size
  report 1
end

to contribute

  let contributor self
  ;; A comoner may contribute to any of its tasks depending on distance
  if any? out-commonertasklink-neighbors [
    ;; TODO: more than one contribution per commoner per tick is possible. Is this the intended behaviour?
    ask out-commonertasklink-neighbors [
      if random-float 1 < contrib-prob [

        ;; Representing a contribution happend
        ask in-commonertasklink-from myself [
          increase-weight
        ]

        ask projecttasklink-neighbors [
          if not commonerprojectlink-neighbor? contributor [
            create-commonerprojectlink-with contributor [ set-commonerprojectlink-parameters ]
          ]
          ask commonerprojectlink-with contributor [
            increase-weight
          ]
        ]
        ask myself [
          set total-contribs total-contribs + 1
        ]

        ;; decreasing the ammount of work to be done in the task
        set time-required time-required - contrib-size
        if time-required < 0 [

          ;; with some probability, a task generates other task when finished
          if random-float 1 < task-hatch-task-prob [
            ;; create another task in the same project
            ask projecttasklink-neighbors [
              hatch-t4sks 1 [
                set-task-parameters
              ]
            ]
          ]

          ;; if the project does not have more tasks, it dies and improve its product by changing its x coordinates
          ask projecttasklink-neighbors [

            if count my-projecttasklinks = 1 [
              ;; improve product if exists
              ifelse any? projectproductlink-neighbors [
                ask projectproductlink-neighbors [
                  ;; improve
                  set xcor min(list -1 (xcor + random 25))
                ]
              ]
              ;; if the project is not linked to a product, it creates a new one
              [
                hatch-products 1 [
                  set interest [interest] of myself
                  set xcor -25 + random 24
                  set ycor -25 + interest
                  set-product-parameters
                ]
              ]
              die ;; project dying
            ]
          ]
          die ;;task dying
        ]
      ]
    ]
  ]
end

to-report find-product-prob
  report min (list max-find-level (1 / (1 + distance myself * find-product-dist)))
end

to find-product
  ;; find product probability based on distance to the product
  ask one-of products with [not member? self out-consumerlink-neighbors] [
    if random-float 1 < find-product-prob [
      create-consumerlink-from myself [set-consumerlink-parameters]
    ]
  ]
end

to-report find-friend-prob
  ;; the probability of finding a friend depends on the ammount of recent contribution done to the task
  ;; TODO: this does no have effect, since it is always bigger than 1
  report find-friend * recent-weight
end

to find-friends
  ;; With some probability set in the parameters,
  ;; create a friendship relationships with other commoners contributing to the same task

  let me self

  ;; contribs are the active task links
  let contribs my-out-commonertasklinks with [ recent-weight > 0 ]

  if count contribs > 0 [
    ;; pick a random active task link
    ask one-of contribs [
      if random-float 1 < min (list max-find-level find-friend-prob) [
        ;; ask the task
        ask other-end [
          ;; pick other contributor with recent contributions
          if any? my-in-commonertasklinks with [recent-weight > 0 and other-end != me] [
            ask one-of my-in-commonertasklinks with [recent-weight > 0 and other-end != me] [
              ;; ask the other contributor to become my friend
              ask other-end [
                ;; If not a friend, create aa frienship
                ifelse not friendlink-neighbor? me [
                  create-friendlink-with me [set-friendlink-parameters]
                ]
                ;; If already friends, increase friendship weight
                [
                  ask friendlink-with me [
                    increase-weight
                  ]
                ]
              ]
            ]
          ]
        ]
      ]
    ]
  ]
end

to-report consume-prob
  ;; probability of consuming a product, depends on the recent conspumtion of any product and the distance to the product
  let current-consumption count my-out-consumerlinks * [recent-weight] of in-consumerlink-from myself

  report min (list 0.8 ((1 + current-consumption) / ( 1 + distance myself * consume-dist) ))
end

to consume
  if any? out-consumerlink-neighbors [
    ask one-of out-consumerlink-neighbors [
      if random-float 1 < consume-prob [
        ask in-consumerlink-from myself [
          increase-weight
        ]
      ]
    ]
  ]
end

to recommend
  ;; This is the way we include commoners in the model
  ;; a commoner recommends a product to a new commoner
  ;; with a probability that depends on the recent consumption activity of that product by that commoner
  ;; and the distance of the product to the center of the model

  if any? my-out-consumerlinks [
    ask one-of my-out-consumerlinks [
      let other-product other-end
      ;; distance of the product to the center of the model
      ;; note that the other product xcor is negative
      let dist 25 - [ xcor ] of other-product
      if random-float 1 < min (list max-find-level (recent-weight / ( 1 + dist * recommend-dist))) [
        ask myself [
          hatch-commoners 1 [
            ;;create-friendlink-with myself [set-friendlink-parameters]
            set-commoner-parameters
            ;; commoners appear at the edge of the model
            set xcor 25
            ;; kill the default link to the closest product that the commoner creates
            ask my-out-consumerlinks [ die ]
            ;; create a link to the recommended product
            create-consumerlink-to other-product [set-consumerlink-parameters]
          ]
        ]
      ]
    ]
  ]
end

to-report propose-project-prob
  ;; The probability of a commoner proposing a new project depends on its recent contribution history and total contribution history
  let total-contrib-effect 1 + ln (1 + [total-contribs] of myself)  * prop-project-total-contrib
  let recent-contrib-effect 1 + ln (1 + sum [recent-weight] of [my-out-commonertasklinks] of myself) * prop-project-recent-contrib

  report (total-contrib-effect / 1000) + (recent-contrib-effect / 1000)

end

to propose-project
  ;; a commoner may hatch a project
  if any? my-out-commonertasklinks [
    ask one-of my-out-commonertasklinks [
      if random-float 1 < min (list max-find-level  propose-project-prob) [
        ask myself [
          hatch-projects 1 [
            set xcor -1 * (random 20) - 5
            set ycor -25 + interest
            carefully [set ycor ycor + random 10 - 5][]
            set-project-parameters

            let my-product one-of [ projectproductlink-neighbors ] of myself

            ;; Half of the new projects are related to an existing product, the other half will create a new product when finished
            if my-product != nobody and random-float 1 < 0.5 [
              create-projectproductlink-with my-product [ set color red ]
            ]
          ]
        ]
      ]
    ]
  ]
end

to leave

  ;; a commoner leaves the community if it has no recent consumption or contributing activity with a small chance
  if not any? my-out-consumerlinks and not any? my-out-commonertasklinks [
    if random-float 1 < 0.01 [
      set dead-commoners-contribs lput total-contribs dead-commoners-contribs
      die
    ]
  ]


  ;; Thre is a small chance for all commoners to leave even if they are currently active
  if random-float 1 < leave-prob [
    die
  ]

end

to product-death
  ask products with [ not any? my-in-consumerlinks ][
     if random-float 1 < (1 / consume-long-forg) [
       die
     ]
  ]
end

to project-death
    ask projects with [ not any? my-commonerprojectlinks ][
     if random-float 1 < (1 / project-long-forg) [
       ask projecttasklink-neighbors [
         die
       ]
       die
     ]
  ]
end
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363
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mean-time-required
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100
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NIL
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323
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num-skills
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100
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SLIDER
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commoners-num
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500
247.0
1
1
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HORIZONTAL

BUTTON
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go once
go
NIL
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

BUTTON
105
10
180
43
NIL
go
T
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

SLIDER
1115
405
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438
commoner-task-attraction-prob
commoner-task-attraction-prob
0
2
1.0
0.1
1
NIL
HORIZONTAL

SLIDER
760
325
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commoner-repulsion-prob
commoner-repulsion-prob
0
1
0.0
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1
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SLIDER
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commoner-product-attraction-prob
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1.0
0.1
1
NIL
HORIZONTAL

SLIDER
760
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398
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product-repulsion-prob
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SLIDER
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405
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438
project-repulsion-prob
project-repulsion-prob
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SLIDER
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PLOT
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Activity
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PLOT
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NIL
NIL
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10.0
0.0
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true
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PENS
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PLOT
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Links count
NIL
NIL
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10.0
0.0
10.0
true
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PENS
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SLIDER
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SLIDER
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10
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HORIZONTAL

SLIDER
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185
1427
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find-task-friends
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10
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SLIDER
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SLIDER
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SLIDER
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SLIDER
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SLIDER
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prop-project-recent-contrib
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PLOT
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490
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610
Contrib Distribution
NIL
NIL
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10.0
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SWITCH
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1
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478
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TEXTBOX
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consume
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0.0
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TEXTBOX
860
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recent contrib
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total-contrib\n
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TEXTBOX
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TEXTBOX
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TEXTBOX
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project prop.
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TEXTBOX
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-- MOVEMENT --
12
0.0
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TEXTBOX
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323
-------- Repulsion: ----------------
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0.0
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TEXTBOX
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330
745
348
Commoners
12
0.0
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TEXTBOX
671
414
731
437
Projects
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TEXTBOX
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398
Products
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TEXTBOX
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------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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0.0
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TEXTBOX
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TEXTBOX
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TEXTBOX
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commoner
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TEXTBOX
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TEXTBOX
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-------- Attraction: --------------------------------------
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0.0
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TEXTBOX
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-- ACTIVITIES --
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0.0
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TEXTBOX
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1622
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find-friend
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0.0
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TEXTBOX
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113
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\n
12
0.0
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TEXTBOX
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------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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TEXTBOX
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------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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TEXTBOX
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Hide links:
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SLIDER
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SLIDER
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consume-recent-forg
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SLIDER
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consume-long-forg
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contrib-recent-forg
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SLIDER
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438
contrib-long-forg
contrib-long-forg
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100
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1
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SLIDER
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project-recent-forg
project-recent-forg
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SLIDER
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project-long-forg
project-long-forg
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100
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1
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SWITCH
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613
hide-commonerprojectlinks?
hide-commonerprojectlinks?
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TEXTBOX
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-------- Links forgetfulness: --------------------------
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0.0
1

PLOT
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490
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610
log Contrib Distribution
NIL
NIL
0.0
1.0
0.0
1.0
true
false
"" ""
PENS
"default" 1.0 2 -16777216 true "" "; the index of eah element in the list\nlet index 1\nplot-pen-reset\nforeach contrib-distrib [ [x] ->\n  if x > 0 [plotxy (ln x) (ln index - ln 1) ]\n  set index 1 + index\n]"

PLOT
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powerlaw pvalue
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PLOT
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power-law alpha
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NIL
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true
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PENS
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contrib-dist
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SLIDER
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pl-tests-every-ticks
pl-tests-every-ticks
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1000
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SWITCH
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493
power-law-tests?
power-law-tests?
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SLIDER
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pl-calc-every-ticks
pl-calc-every-ticks
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SLIDER
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maxTicks
maxTicks
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5000
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SLIDER
192
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maxTurtles
maxTurtles
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100000
2000.0
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SLIDER
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number-of-products
number-of-products
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100
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@#$#@#$#@
Developed by Dr Peter Barbrook-Johnson and Antonio Tenorio-Fornés 2017.

## INTRODUCTION

This model is an implementation of a novel conceptual framework - the ‘Commoners Framework’ - to be used when conceptualising and modelling the behaviour of commons-based peer production (CBPP) communities.

The most up to date version of the model can be accessed at https://github.com/P2Pvalue/CommonersFramework.

**Purpose and development**

The Commoners Framework, and by extension, this model, can be used to represent the behaviour and operation of a wide-range of CBPP communities, and similar organisations (such as those that make use of volunteers). It represents the processes behind individuals’ decisions to contribute to, enter or exit, or make ‘friends’ in, communities. Through this representation of individuals’ behaviour, the framework aims to account for patterns of behaviour observed at the community level. For example, the distribution of participation rates among individuals, which often follows a power law distribution, also known as the ‘1-9-90 rule’; where 1% of the community – the core members – perform most of the work, 9% of the community – the contributors – occasionally contribute and 90% of the community – the users or consumers - use the commons without directly contributing to produce it. The framework was developed based on recent empirical findings on behaviour in a wide variety of communities and was refined using the structural rigour imposed when building an agent-based model (ABM).

**Logic of model**

The focus of the model is Commoners. Commoners is the name given to individuals in a community – both those that contribute, and those that consume the product(s) of a community. The core productive activity of any Commoner is to find tasks in the community, and contribute to them. Their ability to, and likelihood of, contributing will depend on their time available (a resource Commoners have), interests (a Commoner and task parameter which should match), and skill types (a Commoner and task parameter which should match). Commoners may stay in a community, only consuming but not contributing, if no tasks meet their interest or skills. Commoners may make ‘friends’ with others contributing to the same tasks. Having friends increases the chance of finding tasks and contributing. Friends may be lost over time with a certain probability. Commoners’ probability of leaving a community decreases as they make more contributions and have more friends. Contributions improve the quality, or number, of products in the community. More consumption of products increases the probability of existing consumers of these products continuing to consume them, and new Commoners entering the community.


## DETAILS

**Products and Projects**

On the left hand side of the model, goods produced by the community, called "Products", and the projects to produce or improve them, called "Projects" are displayed. Products are the 'box' icons, and Projects are the 'target' icons. Consumption activity (i.e. others consuming a Product) makes Products more appealing to Commoners - this is represented by bringing the Product towards the center of the model. Production activity (i.e. contributions by Commoners) in the "Tasks" of a Project also makes the Project more appealing to contributors, this behaviour is also represented by bringing the Project towards the center. Note, contributions to Projects is made via the multiple Tasks within them (displayed by the green dots inside the target icon).

**Commoners**

Commoners are positioned in the right hand side of the model. The chances of discovering any elements on the left hand side of the model (i.e. Products/Projects/Tasks) depends on the distance between those elements and the Commoner. Not only does consumption and production activity make the Products and Projects more appealing (thus bringing them towards the center) but it also makes the Commoners more likely to engage in the community, thus these activities attracts the Commoners towards the center of the model.

Commoners' recent history of consumption and contribution also affects the chances of current contribution or consumption. Consumption of contrbutions are represented by links, and each consumption/prodution link has a recent weight that accounts for the recent activity, if the weight is 0, the link will be forgoten with some likelihood.

Friendship among Commoners is created when Commoners work in the same task. Having friends increases the likelihood of finding Tasks and contributing to them (if friends are working on them).

**Decay**

The model also include forces that bring the elements towards the edges of the model, thus decreasing their chances to be found or active (i.e. representing some natural decay in engagement over time). This forces are stronger near the center, where elements have to be considerably active to remain.


## THE INTERFACE

*Please note, it is expected only those with at least a basic familiarty of NetLogo will use this model.*

In the upper left corner of the interface, the buttons setup and go will setup and run the model respectively.

Sliders at the left of the model control the number of each of the elements of the model at the start the simulation.

Vertical sliders at the right of the world view set up parameters for the 'find operations' (i.e. find Products, Projects, Tasks and friends) and how much having friends affects these activities. They also set up how much distance is taken into account for the creation of new Products or the arrival of new Commoners.

Horizontal sliders below set the attraction and repulsion of the elements towards the center (e.g. how much contributing to a Task makes a Commoner move towards the center).

Finally, three horizontal sliders at the bottom set how much having friends, having an active recent contribution history, or how many tasks the commoner has found, affects the likelihood of the Commoner contributing.


## PLAYING WITH THE MODEL

The model tries to represent the behaviour in collaborative communities, where contributions and participation often follow a power law distribution where 1% of the community does most of the work, 9% contributes occasionally and the rest only consumes.

Try setting the repulsion, attraction and find probabilities in the model to represent this behaviour. Too much attraction or too little repulsion will make all the elements come towards the center. Few chances of finding tasks and contributing will make the Commoners leave the model, due to their small involvement.
@#$#@#$#@
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@#$#@#$#@
NetLogo 6.0.4
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
<experiments>
  <experiment name="first" repetitions="10" runMetricsEveryStep="true">
    <setup>setup</setup>
    <go>go</go>
    <timeLimit steps="1000"/>
    <metric>count turtles</metric>
    <enumeratedValueSet variable="product-commoner-attraction-prob">
      <value value="0.2"/>
      <value value="0.3"/>
      <value value="0.4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="recommend-dist">
      <value value="1.4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="num-skills">
      <value value="25"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-total-weight">
      <value value="6.1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-long-forg">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-dist">
      <value value="0.8"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="hide-commonertasklinks?">
      <value value="false"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-recent-weight">
      <value value="2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="prop-project-recent-contrib">
      <value value="8"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-project-friends">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-repulsion-prob">
      <value value="0.006"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-friend-task-effect">
      <value value="5.2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-task-friends">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="task-commoner-attraction-prob">
      <value value="0.91"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="mean-time-required">
      <value value="19"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-long-forg">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-task-dist">
      <value value="1.2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-project-dist">
      <value value="5.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="leave-prob">
      <value value="1.0E-4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="number-of-products">
      <value value="&quot;few&quot;"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-friend">
      <value value="0.8"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="hide-consumerlinks?">
      <value value="true"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="initial-projects">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="product-repulsion-prob">
      <value value="0.03"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoners-num">
      <value value="365"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="friends-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-product-dist">
      <value value="0.6"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="task-hatch-task-prob">
      <value value="0.7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-repulsion-prob">
      <value value="0.08"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="friends-long-forg">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="num-interest-categories">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="max-find-level">
      <value value="0.2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-long-forg">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="prop-project-total-contrib">
      <value value="8.4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-recent-forg">
      <value value="20"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-task-attraction-prob">
      <value value="0.08"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-product-attraction-prob">
      <value value="0.6"/>
    </enumeratedValueSet>
  </experiment>
  <experiment name="sensit-product-commoner-attraction-prob" repetitions="5" runMetricsEveryStep="true">
    <setup>setup</setup>
    <go>go</go>
    <timeLimit steps="1000"/>
    <metric>sum sentence contrib-distrib dead-commoners-contribs</metric>
    <metric>(gini-index-reserve / length contrib-distrib) / 0.5</metric>
    <metric>sum [recent-weight] of consumerlinks</metric>
    <metric>sum [recent-weight] of commonertasklinks</metric>
    <metric>count commoners</metric>
    <metric>count projects</metric>
    <metric>count t4sks</metric>
    <metric>count products</metric>
    <metric>count commonerprojectlinks</metric>
    <metric>count commonertasklinks</metric>
    <metric>count consumerlinks</metric>
    <metric>count friendlinks</metric>
    <enumeratedValueSet variable="product-commoner-attraction-prob">
      <value value="0.1"/>
      <value value="0.3"/>
      <value value="0.5"/>
      <value value="0.9"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="recommend-dist">
      <value value="2.9"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="num-skills">
      <value value="25"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-total-weight">
      <value value="4.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-long-forg">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-dist">
      <value value="0.4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="hide-commonertasklinks?">
      <value value="false"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-recent-weight">
      <value value="4.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="prop-project-recent-contrib">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-project-friends">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-repulsion-prob">
      <value value="0.01"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-friend-task-effect">
      <value value="4.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-task-friends">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="task-commoner-attraction-prob">
      <value value="0.59"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="mean-time-required">
      <value value="19"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-long-forg">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-task-dist">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-project-dist">
      <value value="6.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="leave-prob">
      <value value="1.0E-4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="number-of-products">
      <value value="&quot;few&quot;"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-friend">
      <value value="0.7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="hide-consumerlinks?">
      <value value="true"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="initial-projects">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="product-repulsion-prob">
      <value value="0.1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoners-num">
      <value value="250"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="friends-recent-forg">
      <value value="14"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-product-dist">
      <value value="0.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="task-hatch-task-prob">
      <value value="0.8"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-repulsion-prob">
      <value value="0.06"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="friends-long-forg">
      <value value="100"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="num-interest-categories">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="max-find-level">
      <value value="0.2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-long-forg">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="prop-project-total-contrib">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-task-attraction-prob">
      <value value="0.68"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-product-attraction-prob">
      <value value="1"/>
    </enumeratedValueSet>
  </experiment>
  <experiment name="sensit-commoner-product-attraction-prob" repetitions="5" runMetricsEveryStep="true">
    <setup>setup</setup>
    <go>go</go>
    <timeLimit steps="1000"/>
    <metric>sum sentence contrib-distrib dead-commoners-contribs</metric>
    <metric>(gini-index-reserve / length contrib-distrib) / 0.5</metric>
    <metric>sum [recent-weight] of consumerlinks</metric>
    <metric>sum [recent-weight] of commonertasklinks</metric>
    <metric>count commoners</metric>
    <metric>count projects</metric>
    <metric>count t4sks</metric>
    <metric>count products</metric>
    <metric>count commonerprojectlinks</metric>
    <metric>count commonertasklinks</metric>
    <metric>count consumerlinks</metric>
    <metric>count friendlinks</metric>
    <enumeratedValueSet variable="product-commoner-attraction-prob">
      <value value="0.3"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="recommend-dist">
      <value value="2.9"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="num-skills">
      <value value="25"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-total-weight">
      <value value="4.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-long-forg">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-dist">
      <value value="0.4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="hide-commonertasklinks?">
      <value value="false"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-recent-weight">
      <value value="4.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="prop-project-recent-contrib">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-project-friends">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-repulsion-prob">
      <value value="0.01"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-friend-task-effect">
      <value value="4.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-task-friends">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="task-commoner-attraction-prob">
      <value value="0.59"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="mean-time-required">
      <value value="19"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-long-forg">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-task-dist">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-project-dist">
      <value value="6.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="leave-prob">
      <value value="1.0E-4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="number-of-products">
      <value value="&quot;few&quot;"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-friend">
      <value value="0.7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="hide-consumerlinks?">
      <value value="true"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="initial-projects">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="product-repulsion-prob">
      <value value="0.1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoners-num">
      <value value="250"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="friends-recent-forg">
      <value value="14"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-product-dist">
      <value value="0.5"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="task-hatch-task-prob">
      <value value="0.8"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-repulsion-prob">
      <value value="0.06"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="friends-long-forg">
      <value value="100"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="num-interest-categories">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="max-find-level">
      <value value="0.2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-long-forg">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="prop-project-total-contrib">
      <value value="10"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-task-attraction-prob">
      <value value="0.68"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-product-attraction-prob">
      <value value="0.1"/>
      <value value="0.3"/>
      <value value="0.5"/>
      <value value="0.9"/>
    </enumeratedValueSet>
  </experiment>
  <experiment name="sensit-commoner-task-attraction-prob" repetitions="5" runMetricsEveryStep="true">
    <setup>setup</setup>
    <go>go</go>
    <timeLimit steps="1000"/>
    <metric>sum sentence contrib-distrib dead-commoners-contribs</metric>
    <metric>(gini-index-reserve / length contrib-distrib) / 0.5</metric>
    <metric>sum [recent-weight] of consumerlinks</metric>
    <metric>sum [recent-weight] of commonertasklinks</metric>
    <metric>count commoners</metric>
    <metric>count projects</metric>
    <metric>count t4sks</metric>
    <metric>count products</metric>
    <metric>count commonerprojectlinks</metric>
    <metric>count commonertasklinks</metric>
    <metric>count consumerlinks</metric>
    <metric>count friendlinks</metric>
    <enumeratedValueSet variable="commoner-task-attraction-prob">
      <value value="0.1"/>
      <value value="0.3"/>
      <value value="0.5"/>
      <value value="0.9"/>
    </enumeratedValueSet>
  </experiment>
  <experiment name="experiment" repetitions="1" runMetricsEveryStep="true">
    <setup>setup</setup>
    <go>go</go>
    <metric>count turtles</metric>
    <enumeratedValueSet variable="find-project-friends">
      <value value="2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="mean-time-required">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-product-attraction-prob">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="product-commoner-attraction-prob">
      <value value="0.1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoners-num">
      <value value="247"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="num-interest-categories">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-project-dist">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="friends-recent-forg">
      <value value="14"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="pl-tests-every-ticks">
      <value value="250"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="power-law-tests?">
      <value value="true"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="hide-consumerlinks?">
      <value value="true"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="num-skills">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-dist">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-recent-forg">
      <value value="14"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="hide-commonerprojectlinks?">
      <value value="true"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="friends-long-forg">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="task-hatch-task-prob">
      <value value="0.4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-long-forg">
      <value value="14"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="recommend-dist">
      <value value="4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="product-repulsion-prob">
      <value value="0.4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="hide-commonertasklinks?">
      <value value="false"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="task-commoner-attraction-prob">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="contrib-recent-forg">
      <value value="7"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="prop-project-total-contrib">
      <value value="0.2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-long-forg">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="number-of-products">
      <value value="&quot;few&quot;"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-repulsion-prob">
      <value value="0.1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-repulsion-prob">
      <value value="0"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="pl-calc-every-ticks">
      <value value="20"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="consume-dist">
      <value value="4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="leave-prob">
      <value value="2.0E-4"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-task-dist">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-task-attraction-prob">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="prop-project-recent-contrib">
      <value value="0.8"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-task-friends">
      <value value="2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="max-find-level">
      <value value="0.2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="initial-projects">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-friend">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="project-long-forg">
      <value value="14"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="find-product-dist">
      <value value="1"/>
    </enumeratedValueSet>
  </experiment>
  <experiment name="experiment" repetitions="1" runMetricsEveryStep="true">
    <setup>setup</setup>
    <go>go</go>
    <final>print foo</final>
    <metric>count turtles</metric>
    <enumeratedValueSet variable="find-project-friends">
      <value value="2"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="mean-time-required">
      <value value="30"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="commoner-product-attraction-prob">
      <value value="1"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="product-commoner-attraction-prob">
      <value value="0.1"/>
    </enumeratedValueSet>
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</experiments>
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