congre.nlogo

breed [ markets ]
breed [ buyers ]
breed [ sellers ]


;preferences- item x preferences = ordering of item number x in the preference list, 0 represents the most preferred item
;valuations- item x valuations   = value of item number x. 
;payment- valuation of the good received
; we start with a reservation-price of 10 for the agents.. 
buyers-own [preferences valuations reservation-price payment] 

;payment- amount of money(valuation) received for good
sellers-own [good reservation-price payment]

markets-own [computational-cost]

patches-own [market] ;the number of the market agent at this spot.

;profit- the sum of all seller's profit
globals [profit comp-cost]

to setup
  ca
  setup-buyers
  setup-sellers
  setup-markets
end

; just one execution of update means a market start to market close.. keep on looping forever, that would mean, you would know the shifting of congregations.. 
; profit is the average net profit w.r.t to an agent
; comp is the computation cost every agent has to spend for the computations.. every message exchange is 0.1


to update
  if (num-markets != count markets) [
    cp
    ask markets [die]
    setup-markets
    ask buyers [set payment 0]
    ask sellers [set payment 0]
    ]
  ask buyers [go-to-market]
  ask sellers [go-to-market]
  ask markets [do-auction]
  set profit (sum [payment] of sellers ) / num-sellers ; total payment of all the sellers upon num-sellers will give the average netprofit of each seller.. 
  set comp-cost (sum [computational-cost] of markets ) / num-markets 
  ;total computational cost of markets upon number of markets will give the computational cost that each agent has to share
  
  ; Below are the plots - Profit represents average profit for the system. 
  set-current-plot "Profits"
  set-plot-pen-mode 0
  set-current-plot-pen "profit"
  plot profit
  
  set-current-plot-pen "comp"
  plot comp-cost
  set-current-plot "Histogram"
  set-plot-pen-mode 1
  set-plot-x-range 0 10
  set-plot-y-range 0 10
  auto-plot-on
  histogram [payment] of sellers
end

to-report get-random-xcor
    report (random world-width) + min-pxcor
end

to-report get-random-ycor
    report (random world-height) + min-pycor
end

to setup-markets
  set-default-shape markets "box"
  create-markets num-markets [
    set heading 0
    set color white
    set market who
    setxy get-random-xcor get-random-ycor]
  repeat 10 [
    ask markets [disperse]]
  ask markets [
    set heading 0
    set xcor pxcor ;center on patch
    set ycor pycor
    set pcolor white]
end

to setup-buyers
  create-buyers num-buyers [
    setxy get-random-xcor get-random-ycor
    set color green
    set reservation-price (random-float 5.0) + 5.0
    setup-preferences]
end

to setup-sellers
  create-sellers num-sellers [
    setxy get-random-xcor get-random-ycor
    set color red
    set reservation-price (random-float 5.0) + 5.0
    set good random num-goods]
end

;reports list which contains number 0..n-1
to-report make-list [n]
  let l 0
  
  set l lput (n - 1) []
  while [n > 0][
    set n n - 1
    set l lput n l]
  report l
end

to-report randomize-list [lst]
  let i 0
  let len 0
  let num-reps 0
  let a 0
  let a-val 0
  let b 0
  
  set len length lst
  set num-reps len * 2
  while [i < num-reps] [
    set a random len
    set a-val item a lst
    set b random len
    set lst replace-item a lst (item b lst)
    set lst replace-item b lst a-val
    set i i + 1
    ]
  report lst
end

;markets
to disperse
  if (count markets < 2) [stop]
  let closest min-one-of (markets with [who != [who] of myself]) [distance myself]
  if (distance closest > 1) [
    set heading 180 + towards closest
    fd 1
  ]
end

to do-auction
  let producers 0
  let consumers 0
  let next-producer 0
  let winning-buyer 0
  let second-buyer 0
  let num-agents-here 0
  
  set producers sellers-here
  set consumers buyers-here
  set num-agents-here count producers + count consumers
  
  ;they receive payment of 0 if they are unable to do a transaction
  ask producers [set payment 0]
  ask consumers [set payment 0]

  ;cost is calculated like this. 
  set computational-cost 0.1 * (count producers + count consumers ;messages
    + (count producers * count consumers)) ;comparisons
    
  while [any? producers and any? consumers][
    ;find the one whose product has the best (lowest rank) preference from the remaining buyers
;    set next-producer min-one-of producers [min values-from consumers [item (good-of myself) preferences]]
    ;find the one whose product has the highest valuation among the remaining buyers
    
    ;lower the rank, higher the preference.. 
    set next-producer max-one-of producers [max [item ([good] of myself) valuations] of consumers]
    
    
    set winning-buyer max-one-of consumers [item ([good] of next-producer) valuations]
    set second-buyer max-one-of (consumers with [who != [who] of winning-buyer]) [item ([good] of next-producer) valuations]
    if (second-buyer = nobody) [             ;is this OK?
      set second-buyer winning-buyer]
    ask next-producer [
      set payment  (item ([good] of next-producer) ([valuations] of second-buyer)) ]
;    set [payment] of next-producer (item ([good] of next-producer) ([valuations] of second-buyer))
    ask winning-buyer [
      set payment  item ([good] of next-producer) [valuations] of winning-buyer]
;    set [payment] of winning-buyer item ([good] of next-producer) [valuations] of winning-buyer
    set consumers consumers with [who != [who] of winning-buyer]
    set producers producers with [who != [who] of next-producer]
    ]
  ask sellers-here [set payment payment - ([computational-cost] of myself / num-agents-here)]
  ask buyers-here [set payment payment - ([computational-cost] of myself / num-agents-here)]
end

;buyers
to setup-preferences
  let op 0
  
  set op randomize-list make-list num-goods
  set preferences op
  set valuations []
  while [not empty? op][
    set valuations lput (reservation-price * (1 - (first op / num-goods ))) valuations
    set op butfirst op]
end

; go-to-market helps an agent pick up a market at random depending on the payment they get at the close of market.. 
to go-to-market

  let nm 0
  
  ; tau is the threshold.. and tau times reservation price is what an agent checks for while deciding to stay in the congregation or not...   
  if (payment < tau * reservation-price)[

    set nm one-of markets with [who != market]

    ;If there's no other market, then stop.. this error checking condition may not be necessary -- but on a safer note, this one's put up.. 
    if (nm = nobody) [stop]  

    if (distance nm > 1) [
      set heading towards nm
      fd distance nm]
    ]
end
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