pit_cooperation.nlogo

globals [payoff tables]

patches-own [
  is-table?
  pool
]

turtles-own [
  in-game?
  other-player
  money0 money
  recent-lose
  strategy
  memory
]


to setup
  clear-all
  create-the-turtles
  ask patches [set is-table? false]
  set payoff read-from-string payoff-input
  reset-ticks
end

to create-the-turtles
  crt group1 [set strategy strategy-group1]
  crt group2 [set strategy strategy-group2]
  crt group3 [set strategy strategy-group3]
  crt group4 [set strategy strategy-group4]
  ask turtles [
    set in-game? false
    set other-player nobody
    set memory []
    set money 100
    set shape "person"
    setxy random-xcor random-ycor
    set-color-by-strategy
  ]
end



; --------------------------------------------------------------------------------


to go
  ask turtles [
    find-other-player
    if (meet-other-player?)[
      make-bid-and-collect-reward
      if evolutionary? [if [money] of other-player > money [set strategy [strategy] of other-player]]
    ]
  ]

  ask turtles [ move set-color-by-strategy ]

  tick
end


to-report meet-other-player?
  ifelse (is-turtle? other-player)
  [ ifelse ( [other-player] of other-player = self )
    [ report true ]
    [ set other-player nobody
      report false
    ]]
  [ report false ]
end


to make-bid-and-collect-reward
  if who < [who] of other-player [
    let my-bid ( bidding-based-on strategy )
    let other-player-bid ([ bidding-based-on strategy ] of other-player )
    set memory lput (list other-player other-player-bid) memory
    ask other-player [ set memory lput (list other-player other-player-bid) memory ]

    ifelse my-bid + other-player-bid = 2 ; CC
    [ set money money + last payoff
      ask other-player [set money money + last payoff]
    ]
    [ ifelse my-bid = 1 ; CD
      [ set money money + item 2 payoff
        ask other-player [set money money + item 1 payoff] ; other player is defect
      ]
      [ ifelse other-player-bid = 1 ; DC
        [ set money money + item 1 payoff   ; myself is defect
          ask other-player [set money money + item 2 payoff]
        ]
        [
          ; DD
          set money money + item 0 payoff
          ask other-player [set money money + item 0 payoff]
        ]
      ]
    ]
  ]
end


to-report bidding-based-on [my-strategy]
  report runresult my-strategy
end


to find-other-player
  ifelse any? other turtles-here with [not meet-other-player?]
  [ let the-other-player one-of other turtles-here with [other-player = nobody]
    ask the-other-player [ set other-player myself ] ]
  [
    if is-turtle? other-player [
      ask other-player [set other-player nobody]
      set other-player nobody
    ]
  ]

end

to move
  lt random 180 rt random 180 fd 1
end



to-report pure-cooperation
  report 1
end

to-report pure-defection
  report 0
end

to-report tit-for-tat
  let last-opp-action filter [first ? = other-player] memory
  ifelse empty? last-opp-action
  [ report 1 ]
  [ report last last last-opp-action ]
end

to-report steal-from-the-rich
  report ifelse-value ([money] of other-player > money)[0][1]
end


to set-color-by-strategy
  if strategy = "pure-defection" [set color red]
  if strategy = "pure-cooperation" [set color blue]
  if strategy = "tit-for-tat" [set color orange]
  if strategy = "steal-from-the-rich" [set color yellow]
end
@#$#@#$#@
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total-money
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"" ""
PENS
"pure-D" 1.0 0 -2674135 true "" "plot sum [money] of turtles with [strategy = \"pure-defection\"]"
"pure-C" 1.0 0 -13345367 true "" "plot sum [money] of turtles with [strategy = \"pure-cooperation\"]"
"Tic-for-Tac" 1.0 0 -955883 true "" "plot sum [money] of turtles with [strategy = \"tit-for-tat\"]"
"steal-from-the-rich" 1.0 0 -1184463 true "" "plot sum [money] of turtles with [strategy = \"steal-from-the-rich\"]"

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String

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@#$#@#$#@
## WHAT IS IT?

(a general understanding of what the model is trying to show or explain)

## HOW IT WORKS

(what rules the agents use to create the overall behavior of the model)

## HOW TO USE IT

(how to use the model, including a description of each of the items in the Interface tab)

## THINGS TO NOTICE

(suggested things for the user to notice while running the model)

## THINGS TO TRY

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## EXTENDING THE MODEL

(suggested things to add or change in the Code tab to make the model more complicated, detailed, accurate, etc.)

## NETLOGO FEATURES

(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)

## RELATED MODELS

(models in the NetLogo Models Library and elsewhere which are of related interest)

## CREDITS AND REFERENCES

(a reference to the model's URL on the web if it has one, as well as any other necessary credits, citations, and links)
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@#$#@#$#@
NetLogo 5.3.1
@#$#@#$#@
@#$#@#$#@
@#$#@#$#@
<experiments>
  <experiment name="experiment" repetitions="1" runMetricsEveryStep="true">
    <setup>setup</setup>
    <go>go</go>
    <metric>count turtles</metric>
    <enumeratedValueSet variable="strategy-group4">
      <value value="&quot;steal-from-the-rich&quot;"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="evolutionary?">
      <value value="false"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="strategy-group1">
      <value value="&quot;pure-defection&quot;"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="group2">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="payoff-input">
      <value value="&quot;[ 0   2    -1    1  ]&quot;"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="strategy-group2">
      <value value="&quot;pure-cooperation&quot;"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="group3">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="group4">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="group1">
      <value value="50"/>
    </enumeratedValueSet>
    <enumeratedValueSet variable="strategy-group3">
      <value value="&quot;tit-for-tat&quot;"/>
    </enumeratedValueSet>
  </experiment>
</experiments>
@#$#@#$#@
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