coordination game

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Uri Wilensky (Author)

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Click to Run Model

turtles-own [value payoff alt-payoff]

to setup
  ca
 ask patches [sprout 1 
   [ifelse (random 2) = 0 [set value -1 set color red] [set value 1 set color yellow]]]
end 

to go
  if all? turtles [color = red] or all? turtles [color = yellow] [stop]
  ask turtles [
  let his-color [color] of one-of turtles-on neighbors 
    if color = yellow and his-color = yellow [set payoff A-yellow-yellow set alt-payoff B-red-yellow]
    if color = red and his-color = yellow [set payoff B-red-yellow set alt-payoff A-yellow-yellow]
    if color = red and his-color = red [set payoff D-red-red set alt-payoff C-yellow-red]
    if color = yellow and his-color = red [set payoff C-yellow-red set alt-payoff D-red-red]
    if alt-payoff > payoff [if random-float 100 > error-rate [set value 0 - value color-by-value] ]  
  ]  
  tick
  set-current-plot-pen "yellows"
  plot count turtles with [color = yellow]
  set-current-plot-pen "reds"
  plot count turtles with [color = red]
end 

to color-by-value
  ifelse value = 1 [set color yellow] [set color red]
end

There is only one version of this model, created over 14 years ago by Uri Wilensky.

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