egocentricBias.nlogo

turtles-own [
  deg
  decision
  new-decision
  outcome
  sum-outcome
  advice-value
]

to setup
  clear-all
  set-default-shape turtles "person"
  create-turtles agent-count
  resize-world (count turtles / 1.9 * -1) (count turtles / 1.9) (count turtles / 1.9 * -1) (count turtles / 1.9)
  ask turtles [spawn]
  layout-circle turtles (count turtles / 2)
  reset-ticks
end

to go
  if (mean [abs outcome] of turtles < 0.01) [stop]
  ask turtles [prepare-decision]
  ask turtles [make-decision]
  ask turtles [evaluate-decision]
  ; Every few decisions we run an evolutionary algorithm.
  if (ticks mod decision-count = 0) [
    naturally-select
  ]
  tick
end

to spawn
  make-friends
  set decision random-normal 0 1
  evaluate-decision
end

; Forge links with other turtles at random.
; Might make more sense to inherit connections from parents to some extent.
to make-friends
  set deg ifelse-value vary-degree [
    ; Normal distribution around the specified mean.
    degree + random-normal 0 1 * degree
  ][
    degree
  ]
  ; don't allow isolates
  if (deg < 1) [set deg 1]
  repeat (deg - count my-links)[
    create-links-with n-of (deg - count my-links) other turtles
  ]
end

; Decisions are made on the basis of experience of nearby others plus their advice.
to make-decision
  set decision new-decision
end

to prepare-decision
  set new-decision (discounting * advice) + ((1 - discounting) * mean [advice] of in-link-neighbors)
end

to-report advice
  set sum-outcome sum [outcome] of in-link-neighbors
  ifelse (sum-outcome = 0)[
    set advice-value 0
  ][
    set advice-value mean [get-weighted-decision [sum-outcome] of myself] of in-link-neighbors
  ]
  report advice-value
end

; Decision weighted by outcome as a proportion of all relative outcomes
to-report get-weighted-decision [weight]
  report decision * outcome / weight
end

; The decision function currently just rewards values of 0 and penalises other values by their amount
to evaluate-decision
  set outcome -1 * abs decision
end

; Take the best-performing turtles and clone them with a mutation chance.
; The others die.
to naturally-select

end
@#$#@#$#@
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BUTTON
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OBSERVER
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BUTTON
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PLOT
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Inefficiency
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"" ""
PENS
"default" 1.0 0 -16777216 true "" "plot mean [abs outcome] of turtles"

MONITOR
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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

(suggested things for the user to try to do (move sliders, switches, etc.) with the model)

## 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 6.0.2
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@#$#@#$#@
0
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