# Competitive Market

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globals [PriceEquilibrium QuantityEquilibrium QuantityIntercept Prices RandomMeanQuantity RandomMeanPrice] to Setup ;; (for this model to work with NetLogo's new plotting features, ;; __clear-all-and-reset-ticks should be replaced with clear-all at ;; the beginning of your setup procedure and reset-ticks at the end ;; of the procedure.) __clear-all-and-reset-ticks set QuantityIntercept DemandPriceIntercept / abs DemandSlope PlotSupplyAndDemandCurves set QuantityEquilibrium DemandPriceIntercept / (SupplySlope - DemandSlope) set PriceEquilibrium SupplySlope * QuantityEquilibrium PlotSupplyAndDemandResolutions set Prices [] end to PlotSupplyAndDemandCurves set-current-plot "Supply and Demand Curves" set-current-plot-pen "Demand" ;print (word "QuantityIntercept = " QuantityIntercept) plot-pen-up plotxy 0 DemandPriceIntercept plot-pen-down plotxy QuantityIntercept 0 set-current-plot-pen "Supply" plot-pen-up plotxy 0 0 plot-pen-down plotxy QuantityIntercept SupplySlope * QuantityIntercept end to PlotSupplyAndDemandResolutions set-current-plot "Supply and Demand Resolutions" set-current-plot-pen "Demand" print (word "QuantityIntercept = " QuantityIntercept) plot-pen-up plotxy 0 DemandPriceIntercept plot-pen-down plotxy QuantityIntercept 0 set-current-plot-pen "Supply" plot-pen-up plotxy 0 0 plot-pen-down plotxy QuantityIntercept SupplySlope * QuantityIntercept set-current-plot-pen "Average" plot-pen-up plotxy 0 DemandPriceIntercept / 2.0 plot-pen-down plotxy QuantityIntercept ((DemandPriceIntercept + (DemandSlope + SupplySlope) * QuantityIntercept)) / 2.0 set-current-plot-pen "Random Mean" plot-pen-up set RandomMeanQuantity (QuantityEquilibrium / 2) plotxy RandomMeanQuantity 0 let RandomMeanSupply SupplySlope * RandomMeanQuantity let RandomMeanDemand DemandPriceIntercept + DemandSlope * RandomMeanQuantity set RandomMeanPrice (RandomMeanSupply + RandomMeanDemand) / 2.0 plot-pen-down plotxy (QuantityEquilibrium / 2) DemandPriceIntercept end to Go tick let SupplyGuy random-float QuantityTradeMax ; QuantityEquilibrium let SupplyReservation SupplyGuy * SupplySlope let DemandGuy random-float QuantityTradeMax ; QuantityEquilibrium let DemandReservation DemandPriceIntercept + DemandSlope * DemandGuy set-current-plot "Prices" set-plot-x-range 0 round ( DemandPriceIntercept - PriceEquilibrium + 5) set-plot-y-range 0 100 ;( DemandPriceIntercept - PriceEquilibrium) set-histogram-num-bars 100 if (SupplyReservation <= DemandReservation) [let DaPrice (SupplyReservation + DemandReservation) / 2 set Prices lput DaPrice Prices set-current-plot-pen "Price" set-plot-pen-mode 1 plot-pen-down histogram Prices ] ; [print (word "This should not happen! Quitting.") ; let bob 0 ; let carol 3 / bob ; ] end

There is only one version of this model, created almost 3 years ago by Steven Kimbrough.

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