globals [ ratioBrewer ratioWholesaler ratioRetailer userNumbersToNames retailers brewers wholesalers day brewerPurchaseCost brewerSalePrice brewerStorageCost ] breeds [ player ] player-own [ myUserId ; the hubnet id that corresponds to this turtle ; ordersPlaced ; doesn't seem to be used clients ; folks downstream of me supplier ; who goves me my beer inventory ; what i have on hand ; demand ; victor, what was this for ?? --rbs waitingList ; orders i need to fill playerType ; "retailer", "brewer", "wholesaler" lastShipment ; the last shipment i received lastWeekDemand ; the demand i saw over the last week nextOrder ; how much to place on my next order bankAccount ;how much money i have revenueNotGotten breweryList ; used only by brewers ] to startup hubnet-set-client-interface "COMPUTER" [ "clients/Beer Game Alternate 2 client.nlogo" ] hubnet-reset setup end to setup set ratioBrewer 1 set ratioWholesaler 2 set ratioRetailer 6 set userNumbersToNames [] set day 0 set brewerPurchaseCost .25 set brewerSalePrice .6 set brewerStorageCost .10 end to Go ;ask player [ sendInfoToClient ] advanceClock processOrders ask player [ sendInfoToClient ] ;ask player [ set lastWeekDemand 0 ] wait 2 end to reset set day 0 ask player [ resetPlayerValues ] end to advanceClock set day day + 1 end to processOrders if (day > 6 ) and (currentDay day = "Friday") ; the day the supppliers receive new orders [ ask player with [(playerType = "wholesaler") or (playerType = "brewer")] [ set lastWeekDemand 0 ] ] if (day > -1 ) and (currentDay day = "Tuesday") ; the day the supppliers receive new orders [ ask player ;with [(playerType = "wholesaler") or (playerType = "brewer")] [ set lastShipment 0 ] ] ; if currentDay day = "Saturday" ; the day the Brewers receive new orders ; [ ; ask player with [playerType = "brewer"] ; [ ; set lastWeekDemand 0 ; ] ; ] ask player [ pump ] end to-report RepresentDay [d] ;;convert from a day number to a pretty string report (currentDay d) + " of Week " + (currentWeek d) end to-report currentDay [d] if d mod 7 = 0 [ report "Sunday" ] if d mod 7 = 1 [ report "Monday" ] if d mod 7 = 2 [ report "Tuesday" ] if d mod 7 = 3 [ report "Wednesday" ] if d mod 7 = 4 [ report "Thursday" ] ifelse d mod 7 = 5 [ report "Friday" ] [ report "Saturday" ] end to-report currentWeek [d] report floor (1 + (d / 7)) end ;reports current week ;;;;;;;;;;;;;;;;;;; ; Player procedures ;;;;;;;;;;;;;;;;;;; to add-new-client [newclient] set clients fput newclient clients end ;add new client to supplier's list ;;;;;;;;;;;;; ;victor's code of death ;;;;;;;;;;;;; to chargeForStorage set bankAccount (bankAccount - (inventory * roleCoefficient playerType) * brewerStorageCost) ;charge for leftover inventory end to placeOrder [myOrder] ; myOrder = number of units to order locals [ tempList newOrder ] ;show myUserId + "lowering account for " + inventory + " times " + roleCoefficient playerType * brewerStorageCost ifelse playerType = "brewer" [ without-interruption [ set breweryList lput myOrder breweryList ] ] [ ; everybody Else set newOrder list myUserId myOrder ;show "Created a new order: " + newOrder ask supplier ;player with [myUserId = supplier-of myself] [ without-interruption [ set tempList lput newOrder first reverse waitingList ;set tempList lput (list (myUserId-of myself) myOrder) (first (reverse waitingList)) set waitingList replace-item ( (length waitingList) - 1) waitingList tempList ;set waitingList reverse (fput tempList (butfirst reverse waitingList)) set lastWeekDemand lastWeekDemand + myOrder ;update what will be the suppliers demand ] ;sendInfoToClient ] ] end to pump ; Place Receive ;R Fri Tue ;W Fri Tue ;B Fri Tue if currentDay day = "Tuesday" [ chargeForStorage ] if playerType = "retailer" [ ifelse (inventory > 0) and (consumerDemand > 0) [ ifelse (consumerDemand < inventory) [ set bankAccount (bankAccount + (4 * brewerSalePrice * consumerDemand)) set inventory (inventory - consumerDemand) ] [ if (consumerDemand > inventory) [ set bankAccount (bankAccount + (4 * brewerSalePrice * inventory)) set revenueNotGotten revenueNotGotten + (4 * brewerSalePrice * abs (consumerDemand - inventory)) set inventory 0 ] ] ] [ ;else if inventory = 0 [ set revenueNotGotten revenueNotGotten + (4 * brewerSalePrice * (consumerDemand)) ] ] ; ifelse ((inventory - consumerDemand) >= 0) ; [ ; set inventory (inventory - consumerDemand) ; ; ] ; [ ; ; set inventory 0 ; ] if currentDay day = "Friday" [ placeOrder nextOrder ] ] if playerType = "wholesaler" [ if currentDay day = "Tuesday" [ supplyDownstream ] if currentDay day = "Friday" [ placeOrder nextOrder ] ] if playerType = "brewer" [ if currentDay day = "Tuesday" [ without-interruption [ set inventory inventory + first breweryList set lastShipment first breweryList set bankAccount (bankAccount - first breweryList * brewerPurchaseCost) set breweryList butfirst breweryList ] ] if currentDay day = "Tuesday" [ supplyDownstream ] if currentDay day = "Friday" [ placeOrder nextOrder ] ] end to-report roleCoefficient [role] if role = "brewer" [ report 1 ] if role = "wholesaler" [ report 2 ] if role = "retailer" [ report 4 ] end to supplyDownstream locals [ thisWeek keepLooping ] ;; pop the first guy off without-interruption [ set thisWeek first waitingList set waitingList lput [] butfirst waitingList ] set keepLooping true ;; go through the shit from this week while [keepLooping = true] [ if inventory = 0 [ set keepLooping false ] ifelse everybodyFilled? thisWeek [ set keepLooping false ] [ set thisWeek fillFirstOrder thisWeek ] ] if inventory = 0 ; push stuff into being due next week [ set waitingList replace-item 0 waitingList mergeWeeks (reverse thisWeek) first waitingList ] end to-report mergeWeeks [leftWeek rightWeek] ;;returns the result of merging the two weeks passed as params. I guess netlogo doesn't have some sort of list merging operator... ifelse length leftWeek = 0 [ report rightWeek ] [ report mergeWeeks butfirst leftWeek fput first leftWeek rightWeek ] end to-report fillFirstOrder [openWeek] ;;allocates one unit from inventory to the first open order, removes empty orders from this weeks queue locals [ toWhom newOrder newAmount ] if inventory < 1 [ report openWeek ] if length openWeek = 0 [ report [] ] if not is-number? (first butfirst first openWeek) [ show "openWeek: " + openWeek show 3 / 0 ] ifelse ((first butfirst first openWeek) < 1) ;; in other words, this order has been filled [ report fillFirstOrder butfirst openWeek ] [ set toWhom first first openWeek ;;increase the recipient's inventory by one without-interruption [ ask player with [myUserId = toWhom] [ set inventory inventory + 1 set bankAccount (bankAccount - roleCoefficient playerType * brewerPurchaseCost) ;charge the client for the one beer set lastShipment lastShipment + 1 ] set inventory inventory - 1 set bankAccount (bankAccount + roleCoefficient playerType * brewerSalePrice) ;add money to my account set newAmount ( ( first butfirst first openWeek) - 1 ) set newOrder list toWhom newAmount ] report lput newOrder butfirst openWeek ] end to-report sumOfOrdersForWeek [aWeek] ;; report the sum of the orders that are due this week ifelse (length aWeek) = 0 [ report 0 ] [ report first butfirst first aWeek + sumOfOrdersForWeek butfirst aWeek ] end to-report everybodyFilled? [orders] ;; report true if all the orders are down to zero ifelse 0 = length orders [ report true ] [ ifelse 0 = first butfirst first orders [ report everybodyFilled? butfirst orders ] [ report false ] ] end to initializePlayer [newUserId newPlayerType newSupplier newInventory] show newUserId + " has supplier " + newSupplier + " inv = " + newInventory set myUserId newUserId set clients [] set supplier newSupplier set inventory newInventory ;set demand 0 set playerType newPlayerType resetPlayerValues if supplier != nobody [ ask supplier [ add-new-client myself ] ] end to resetPlayerValues show "resetPlayerValues for " + myUserId ifelse (playerType = "retailer") [ set lastWeekDemand consumerDemand * 7 ; ; not used set waitingList [ [] ] set inventory startingRetailerInventory ];else [ ifelse (playerType = "wholesaler") [ set waitingList [ [] [] [] [] ] set lastWeekDemand floor (consumerDemand * 7 * (ratioRetailer / ratioWholesaler)) set inventory startingWholesalerInventory ] [ ;; brewer set waitingList [ [] [] [] [] ] set lastWeekDemand floor (consumerDemand * 7 * (ratioRetailer / ratioBrewer ) ) set breweryList (list lastWeekDemand lastWeekDemand ) set inventory startingBrewerInventory ] ] set lastShipment lastWeekDemand set nextOrder lastShipment set bankAccount 100 set revenueNotGotten 0.00 end to processMessage [incomingMessage] if incomingMessage = "^" [ set nextOrder nextOrder + 7 ] if incomingMessage = "v" and nextOrder > 0 [ set nextOrder nextOrder - 7 ] hubnet-send myUserId "Next Order To Place" nextOrder ; sendInfoToClient end to sendOneTimeInfo hubnet-send myUserId "You are a" playerType ifelse playerType = "brewer" [ hubnet-send myUserId "Your Supplier Is" "not applicable" ] [ hubnet-send myUserId "Your Supplier Is" myUserId-of supplier ] hubnet-send myUserId "Sale Price per Beer" "$" + roleCoefficient playerType * brewerSalePrice + "0" ifelse playerType = "brewer" ;to prevent purchase price being $0.250 [ hubnet-send myUserId "Purchase Cost per Beer" "$" + roleCoefficient playerType * brewerPurchaseCost ] [ hubnet-send myUserId "Purchase Cost per Beer" "$" + roleCoefficient playerType * brewerPurchaseCost + "0" ] hubnet-send myUserId "Storage Cost per Beer" "$" + roleCoefficient playerType * brewerStorageCost + "0" end to sendInfoToClient hubnet-send myUserId "Inventory On Hand" inventory hubnet-send myUserId "Last Incoming Shipment" lastShipment ;hubnet-send myUserId "Waiting List" waitingList hubnet-send myUserId "Today Is" RepresentDay day hubnet-send myUserId "Next Order To Place" nextOrder ifelse playerType = "retailer" [ hubnet-send myUserId "Current Downstream Demand" "" + (consumerDemand * 7) + " per week" ] [ hubnet-send myUserId "Current Downstream Demand" lastWeekDemand ] ifelse playerType = "retailer" [ hubnet-send myUserId "Potential Revenue Missed" "$" + precision revenueNotGotten 2 + "0" hubnet-send myUserId "Requested for delivery this week" "not applicable" ] [ hubnet-send myUserId "Potential Revenue Missed" "not applicable" hubnet-send myUserId "Requested for delivery this week" sumOfOrdersForWeek first waitingList ] ifelse day < 2 ;if it's before the first Tuesday, don't show the extra 0 [ hubnet-send myUserId "Bank Account" "$" + precision bankAccount 2 ] [ hubnet-send myUserId "Bank Account" "$" + precision bankAccount 2 + "0" ] end to BuildAllInitialWaitingLists ; observer ask player with [(playerType = "brewer") or (playerType = "wholesaler")] [ buildMyInitialWaitingList ] end to buildMyInitialWaitingList ; for when we start the game, to be called after everyone has joined locals [ doTimes ] show "building " + myUserId + "'s initial waiting list using: " + waitingList set doTimes length waitingList set waitingList [] repeat doTimes [ set waitingList fput makeOneWeekInitialWaitingList waitingList ] end to-report makeOneWeekInitialWaitingList ; player procedure locals [ myOutput incredibleShrinkingClients howMuchToOrder ] set myOutput [] set incredibleShrinkingClients clients repeat length clients [ ; show "making week with remainder list : " + incredibleShrinkingClients set myOutput fput (list myUserId-of first incredibleShrinkingClients nextOrder-of first incredibleShrinkingClients ) myOutput set incredibleShrinkingClients butfirst incredibleShrinkingClients ] report myOutput end ;;;;;;;;;;;;;;;;;;;;;;;; ;Client-Server Stuff ; ;;;;;;;;;;;;;;;;;;;;;;;; to listen-clients while [ hubnet-message-waiting? ] [ hubnet-fetch-message ifelse hubnet-enter-message? [ onUserConnect hubnet-message-source ] [ ifelse hubnet-exit-message? [ noOp ] [ ask player with [myUserId = hubnet-message-source] [ processMessage hubnet-message-tag ] ] ] ] end to onUserConnect [newUserId] set userNumbersToNames lput newUserId userNumbersToNames create-custom-player 1 [ initializePlayer newUserId (getRole getUserNumber newUserId) (getBestSupplier getRole getUserNumber newUserId) defaultStartInventory getRole getUserNumber newUserId sendInfoToClient sendOneTimeInfo ] end to noOp end to-report defaultStartInventory [role] ifelse role = "retailer" [ report startingRetailerInventory ] [ ifelse role = "wholesaler" [ report startingWholesalerInventory ] [ report startingBrewerInventory ] ] end;reports starting inventory as read from slider to-report getBestSupplier [role] ;;used to assign new players their upstream ifelse role = "retailer" [ report min-one-of (player with [playerType = "wholesaler"]) [length clients] ] [ ifelse role = "wholesaler" [ report min-one-of (player with [playerType = "brewer"]) [length clients] ] [ report nobody ] ] end ;;getBestSupplier to-report getUserNumber [userId] report position userId userNumbersToNames end to-report getUserName [userNumber] report item userNumber userNumbersToNames end to-report getRole [n] ;; get the role of the nTh person to join ;; outputs "brewer", "wholesaler", or "retailer" depending upon what the new user should be locals [ postMod ] set postMod n mod (ratioBrewer + ratioWholesaler + ratioRetailer) ifelse postMod < ratioBrewer [ report "brewer" ] [ ifelse postMod < ratioWholesaler + ratioBrewer [ report "wholesaler" ] [ report "retailer" ] ] end ;;getRole ; *** NetLogo Model Copyright Notice *** ; ; This activity and associated models and materials was created as part of the projects: ; PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN CLASSROOMS and ; INTEGRATED SIMULATION AND MODELING ENVIRONMENT. ; These projects gratefully acknowledge the support of the ; National Science Foundation (REPP & ROLE programs) -- grant numbers ; REC #9814682 and REC-0126227. ; ; Copyright 2003 by Uri Wilensky & Walter Stroup. Updated 2003. All rights reserved. ; ; Permission to use, modify or redistribute this model is hereby granted, ; provided that both of the following requirements are followed: ; a) this copyright notice is included. ; b) this model will not be redistributed for profit without permission ; from the copyright holders. ; Contact the copyright holders for appropriate licenses for redistribution ; for profit. ; ; To refer to this model in academic publications, please use: ; Wilensky, U. & Stroup, W. (2003). NetLogo HubNet Beer Game Alternate 2 model. ; http://ccl.northwestern.edu/netlogo/models/HubNetBeerGameAlternate2 ; Center for Connected Learning and Computer-Based Modeling, ; Northwestern University, Evanston, IL. ; ; In other publications, please use: ; Copyright 2003 by Uri Wilensky and Walter Stroup. All rights reserved. See ; http://ccl.northwestern.edu/netlogo/models/HubNetBeerGameAlternate2 ; for terms of use. ; ; *** End of NetLogo Model Copyright Notice *** @#$#@#$#@ GRAPHICS-WINDOW 502 473 687 679 17 17 5.0 1 10 1 1 1 CC-WINDOW 3 408 491 557 Command Center BUTTON 314 41 426 74 Go Go T 1 T OBSERVER T SLIDER 51 83 252 116 startingBrewerInventory startingBrewerInventory 0 200 126 1 1 NIL SLIDER 50 151 251 184 startingRetailerInventory startingRetailerInventory 0 50 21 1 1 NIL SLIDER 50 117 251 150 startingWholesalerInventory startingWholesalerInventory 0 100 63 1 1 NIL SLIDER 64 195 236 228 ConsumerDemand ConsumerDemand 0 50 1 1 1 NIL BUTTON 17 41 88 74 Listen listen-clients T 1 T OBSERVER T MONITOR 76 262 214 311 Day RepresentDay day 3 1 BUTTON 357 97 427 130 Reset reset NIL 1 T OBSERVER T BUTTON 108 41 297 74 Ready To Go buildAllInitialWaitingLists NIL 1 T OBSERVER T @#$#@#$#@ SPECIAL NOTE ------------ "Beer Game Alternate 1" and "Beer Game Alternate 2" are supplied with this release as examples of other possible approaches to designing and implementing a Beer Game activity. The main Beer Game activity is the one we have developed most fully in terms of: design; reliability and robustness; documentation; and quality of code. However, we felt that users might also be interested in seeing these other implementations. Be cautious if intending to use the alternates with an actual group. WHAT IS IT? ----------- This is a HubNet Participatory simulation of the Beer Game. The beer game is a model of a product distribution system. Players play as either retailers (who see demand from consumers and order from wholesalers), wholesalers (who see demand from retailers and order from brewers), or brewers (who see demand from wholesalers and produce the beer to give to wholesalers). Players try to maximize their profit, which is derived from selling the most beer possible. Buying beer and keeping it in inventory costs money. Crucial is the fact that beer is not delivered immediately upon order placement; rather, retailers and wholesalers wait an average of four weeks to receive their orders. Wholesalers and brewers maintain a waiting list of orders received but not yet filled. Beer to satisfy this waiting list is alloted as soon as possible. HOW TO USE IT ------------- For the administrator, press the Listen button and leave it pressed while participants log onto the simulation. Once everyone is logged on, click the Ready To Go button. When you are ready to begin play, click Go and leave it depressed until you wish to end play. For players, the only actions required while playing the game are increasing and decreasing the size of orders placed each week. The interface tells players what their role is, who their supplier is, and the financial costs and revenues per unit of beer. Orders are sent to the supplier using whatever value is in the Next Order to Place monitor on Friday. Orders are received on Tuesday. Inventory costs are assessed on Tuesday also. The Requested for delivery monitor (only used by wholesalers and brewers) tells users how much beer should be delivered in the current week. For example, if two units were ordered four weeks ago to be delivered this week and two units last week went unfilled, the requested for delivery monitor would indicate four. THINGS TO NOTICE ---------------- While playing, players should try to make note of how demand changes over time. This can be useful in analyzing the behavior of the system at the end of the game. THINGS TO TRY ------------- The administrator of the game should initially let consumer demand remain stable. Once players are comfortable with the steady state of the system, the administrator should double or triple consumer demand. Players who are unfamiliar with the emergent dynamics of the system will often greatly exaggerate the change in demand when placing their own orders. Usually, this results in bankrupcy. EXTENDING THE MODEL ------------------- Users could modify the model to change the latencies of the game or to adjust the ratio of retailers to wholesalers to brewers. Also, try to add an additional role in the system, such as a distributor. See if this changes the dynamics of the system. NETLOGO FEATURES ---------------- This model uses NetLogo's HubNet to handle interactions with players. A future version of this model will use NetLogo's nascent peer-to-peer networking to allow players to customize the information they see during game play, as well as write code to play on their behalf. RELATED MODELS -------------- Tragedy of the Commons CREDITS AND REFERENCES ---------------------- See Senge's "The Fifth Discipline" for more information about the beer game. This activity and associated models and materials was created as part of the projects: PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN CLASSROOMS and INTEGRATED SIMULATION AND MODELING ENVIRONMENT. These projects gratefully acknowledge the support of the National Science Foundation (REPP & ROLE programs) -- grant numbers REC #9814682 and REC-0126227. Copyright 2003 by Uri Wilensky & Walter Stroup. All rights reserved. Permission to use, modify or redistribute this model is hereby granted, provided that both of the following requirements are followed: a) this copyright notice is included. b) this model will not be redistributed for profit without permission from the copyright holders. Contact the copyright holders for appropriate licenses for redistribution for profit. To refer to this model in academic publications, please use: Wilensky, U. & Stroup, W. (2003). NetLogo HubNet Beer Game Alternate 2 model. http://ccl.northwestern.edu/netlogo/models/HubNetBeerGameAlternate2. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL. In other publications, please use: Copyright 2003 by Uri Wilensky and Walter Stroup. All rights reserved. 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