globals [partner-is-silent?] to setup clear-all ;;Build the jail cell ask patches with [ count neighbors != 8 ] [ set pcolor gray] ;;make the face visible crt 1 [set color gray set size 30 set shape "face"] ;; set up the prisoner's dilemma ifelse partner-silence-known? [ set partner-is-silent? partner-silent? ] [ ;;if partner silence is not known, choose randomly whether or not he is silent. ifelse random 2 = 0 [ set partner-is-silent? true ] [ set partner-is-silent? false ] ] end ;;play the game, changing the face depending on the outcome. to answer setup ;;clears variables away so that setup doesn't need to be pressed every time. ;;next the four possible combinations of choices are dealt with. ;;the result corresponds to the tables in the interface and Info tabs. ;;first check to see if your partner was silent. ifelse partner-is-silent? [ ;;now go through your two possible choices ifelse you-silent? [ ask turtles [set shape "face silent"] user-message "You and your partner both remain silent. You are sentenced to one year imprisonment." ] [ ask turtles [set shape "face devious"] user-message "You confess and your partner remains silent. You go free." ] ] ;;your partner confessed. [ ;;again go through your two possible choices ifelse you-silent? [ ask turtles [set shape "face sucker" ] user-message "You remain silent, but your partner confesses. You are sentenced to five years imprisonment." ] [ ask turtles [set shape "face rational"] user-message "You and you partner both confess. You are sentenced to three years imprisonment." ] ] end ; Copyright 2002 Uri Wilensky. ; See Info tab for full copyright and license. @#$#@#$#@ GRAPHICS-WINDOW 313 10 673 391 17 17 10.0 1 10 1 1 1 0 0 0 1 -17 17 -17 17 0 0 0 ticks 30.0 BUTTON 169 80 269 113 NIL answer NIL 1 T OBSERVER NIL NIL NIL NIL 1 SWITCH 64 179 268 212 partner-silent? partner-silent? 1 1 -1000 BUTTON 64 80 168 113 NIL setup NIL 1 T OBSERVER NIL NIL NIL NIL 1 SWITCH 64 113 268 146 you-silent? you-silent? 0 1 -1000 SWITCH 64 146 268 179 partner-silence-known? partner-silence-known? 0 1 -1000 TEXTBOX 119 317 300 377 TRUE FALSE\nTRUE 1 year 5 years\nFALSE none 3 years 11 0.0 0 TEXTBOX 14 249 302 279 YOUR JAIL TIME\n-------------------------------------------------------------- 11 0.0 0 TEXTBOX 176 285 298 303 partner-silent? 11 0.0 0 TEXTBOX 21 339 111 357 you-silent? 11 0.0 0 TEXTBOX 14 24 308 80 Decide whether to remain silent or confess and then answer the police to receive your sentence. 11 0.0 0 @#$#@#$#@ ## それは何か? あなたとパートナーは銀行強盗の罪で逮捕され,クラッシックな「囚人のジレンマ」モデルにより,あなた達 自身を見出します. 警察は別々の部屋にあなた達を入れて,次の提案を行います. 我々は君たちが 2 つの罪を犯したことを知っている.強盗の罪を二人が自白すれば,裁判官は寛大な 対応を行い,ともに懲役 3 年の刑となるだろう.しかし,二人ともが自白せず,我々が強盗罪を証明で きない場合は,銃所有の罪のみで二人とも懲役 1 年の刑となるだろう. もしあなたのパートナーが自白 してあなたが黙秘するなら,あなたに対し 5 年の刑期を与えるつもりだ.もしあなたのパートナーが自白せ ず,あなたが自白するなら,我々はあなたを自由の身にするだろう. あなたは黙秘するか,あるいは自白すべきか. あなたがどのくらいの刑期になるかは,あなたのパートナーの答えに依存する. 次の表は,4 つの異なった状況を示している. あなたの行動 | パートナーの行動 | あなたの刑期 | パートナーの刑期 ---------------------------------------------------------------------- 黙秘 黙秘 1 1 黙秘 自白 5 0 自白 黙秘 0 5 自白 黙秘 3 3 (表内の数字は刑期の期間を表わす) ## 使い方 SETUP:囚人のジレンマについて,あなた自身の立場を決めてください. ANSER:警察に答え,あなたへの判決を受け取ってください. YOU-SILENT? :スイッチONは黙秘,スイッチOFFは自白. partner with the PARTNER-SILENT? switch. スイッチ ON は,パートナーはあなたの黙秘の回答を知っている. スイッチ OFF は,パートナーはあなたの黙秘の回答を知らない. スイッチを切り替えることにより,パートナーの行動を支配できます. スイッチ ON:パートナーは黙秘の回答, スイッチ OFF:パートナーは自白の回答. ## 試してみよう PARTNER-SILENCE-KNOWN?のスイッチをオフにして,あなたの判決を最小にしてみてください.パ ートナーよりも,ベターな判決になりましたか?それはなぜでしょう?どうしてですか? どのような戦略がグループにとってベストでしょう? 現実の人生から囚人のジレンマと同じようなシナリオを記述しましょう. 最も良い決定は何でしたか?それはなぜでしょう? ## 拡張モデル 囚人のジレンマ,二人の人物の反復モデルを試してみましょう. ## NETLOGO FEATURES The use of the USER-MESSAGE primitive to give the prison sentence. The use the SIZE turtle variable and TURTLE SIZES option on the view to make large faces. The use of the SHAPE turtle variable to change the faces. ## RELATED MODELS PD Two Person Iterated PD N-Person Iterated PD Basic Evolutionary ## HOW TO CITE If you mention this model in a publication, we ask that you include these citations for the model itself and for the NetLogo software: * Wilensky, U. (2002). NetLogo PD Basic model. http://ccl.northwestern.edu/netlogo/models/PDBasic. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL. * Wilensky, U. (1999). NetLogo. http://ccl.northwestern.edu/netlogo/. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL. ## COPYRIGHT AND LICENSE Copyright 2002 Uri Wilensky. ![CC BY-NC-SA 3.0](http://i.creativecommons.org/l/by-nc-sa/3.0/88x31.png) This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA. Commercial licenses are also available. To inquire about commercial licenses, please contact Uri Wilensky at uri@northwestern.edu. This model was created as part of the projects: PARTICIPATORY SIMULATIONS: NETWORK-BASED DESIGN FOR SYSTEMS LEARNING IN CLASSROOMS and/or INTEGRATED SIMULATION AND MODELING ENVIRONMENT. The project gratefully acknowledges the support of the National Science Foundation (REPP & ROLE programs) -- grant numbers REC #9814682 and REC-0126227. @#$#@#$#@ default true 0 Polygon -7500403 true true 150 5 40 250 150 205 260 250 airplane true 0 Polygon -7500403 true true 150 0 135 15 120 60 120 105 15 165 15 195 120 180 135 240 105 270 120 285 150 270 180 285 210 270 165 240 180 180 285 195 285 165 180 105 180 60 165 15 arrow true 0 Polygon -7500403 true true 150 0 0 150 105 150 105 293 195 293 195 150 300 150 box false 0 Polygon -7500403 true true 150 285 285 225 285 75 150 135 Polygon -7500403 true true 150 135 15 75 150 15 285 75 Polygon -7500403 true true 15 75 15 225 150 285 150 135 Line -16777216 false 150 285 150 135 Line -16777216 false 150 135 15 75 Line -16777216 false 150 135 285 75 bug true 0 Circle -7500403 true true 96 182 108 Circle -7500403 true true 110 127 80 Circle -7500403 true true 110 75 80 Line -7500403 true 150 100 80 30 Line -7500403 true 150 100 220 30 butterfly true 0 Polygon -7500403 true true 150 165 209 199 225 225 225 255 195 270 165 255 150 240 Polygon -7500403 true true 150 165 89 198 75 225 75 255 105 270 135 255 150 240 Polygon -7500403 true true 139 148 100 105 55 90 25 90 10 105 10 135 25 180 40 195 85 194 139 163 Polygon -7500403 true true 162 150 200 105 245 90 275 90 290 105 290 135 275 180 260 195 215 195 162 165 Polygon -16777216 true false 150 255 135 225 120 150 135 120 150 105 165 120 180 150 165 225 Circle -16777216 true false 135 90 30 Line -16777216 false 150 105 195 60 Line -16777216 false 150 105 105 60 car false 0 Polygon -7500403 true true 300 180 279 164 261 144 240 135 226 132 213 106 203 84 185 63 159 50 135 50 75 60 0 150 0 165 0 225 300 225 300 180 Circle -16777216 true false 180 180 90 Circle -16777216 true false 30 180 90 Polygon -16777216 true false 162 80 132 78 134 135 209 135 194 105 189 96 180 89 Circle -7500403 true true 47 195 58 Circle -7500403 true true 195 195 58 circle false 0 Circle -7500403 true true 0 0 300 circle 2 false 0 Circle -7500403 true true 0 0 300 Circle -16777216 true false 30 30 240 cow false 0 Polygon -7500403 true true 200 193 197 249 179 249 177 196 166 187 140 189 93 191 78 179 72 211 49 209 48 181 37 149 25 120 25 89 45 72 103 84 179 75 198 76 252 64 272 81 293 103 285 121 255 121 242 118 224 167 Polygon -7500403 true true 73 210 86 251 62 249 48 208 Polygon -7500403 true true 25 114 16 195 9 204 23 213 25 200 39 123 cylinder false 0 Circle -7500403 true true 0 0 300 dot false 0 Circle -7500403 true true 90 90 120 face false 0 Circle -7500403 false true 61 60 179 Circle -7500403 false true 94 90 31 Circle -7500403 false true 174 89 33 Circle -7500403 false true 138 138 21 Rectangle -7500403 false true 105 181 195 195 Circle -13345367 true false 106 101 11 Circle -13345367 true false 179 103 12 face devious false 0 Circle -7500403 false true 59 58 181 Line -2674135 false 101 88 135 128 Line -2674135 false 206 88 176 129 Line -2674135 false 84 183 144 216 Line -2674135 false 210 176 143 215 Line -2674135 false 70 103 75 26 Line -2674135 false 229 102 218 24 Line -2674135 false 75 26 84 80 Line -2674135 false 217 23 211 78 Line -2674135 false 133 127 101 106 Line -2674135 false 101 106 100 89 Line -2674135 false 176 128 204 104 Line -2674135 false 204 104 205 87 Line -2674135 false 85 183 209 176 face happy false 0 Circle -7500403 true true 8 8 285 Circle -16777216 true false 60 75 60 Circle -16777216 true false 180 75 60 Polygon -16777216 true false 150 255 90 239 62 213 47 191 67 179 90 203 109 218 150 225 192 218 210 203 227 181 251 194 236 217 212 240 face neutral false 0 Circle -7500403 true true 8 7 285 Circle -16777216 true false 60 75 60 Circle -16777216 true false 180 75 60 Rectangle -16777216 true false 60 195 240 225 face rational false 0 Circle -7500403 false true 59 57 184 Circle -7500403 false true 95 83 34 Circle -7500403 false true 177 84 37 Circle -7500403 false true 141 138 21 Line -7500403 true 102 208 154 195 Line -7500403 true 153 195 206 208 Circle -13345367 true false 105 94 13 Circle -13345367 true false 189 95 14 Line -7500403 true 101 206 152 182 Line -7500403 true 152 182 205 208 face sad false 0 Circle -7500403 true true 8 8 285 Circle -16777216 true false 60 75 60 Circle -16777216 true false 180 75 60 Polygon -16777216 true false 150 168 90 184 62 210 47 232 67 244 90 220 109 205 150 198 192 205 210 220 227 242 251 229 236 206 212 183 face silent false 0 Circle -7500403 false true 57 57 184 Circle -7500403 false true 102 86 34 Circle -7500403 false true 178 86 35 Line -7500403 true 103 195 151 214 Line -7500403 true 151 214 219 196 Circle -13345367 true false 112 97 12 Circle -13345367 true false 189 98 11 Circle -7500403 false true 141 138 20 Line -7500403 true 104 194 218 196 face sucker false 0 Circle -7500403 false true 60 59 183 Line -7500403 true 97 96 137 132 Line -7500403 true 126 93 101 134 Line -7500403 true 158 91 202 130 Line -7500403 true 192 89 165 134 Line -7500403 true 102 210 154 194 Line -7500403 true 154 194 209 204 fish false 0 Polygon -1 true false 44 131 21 87 15 86 0 120 15 150 0 180 13 214 20 212 45 166 Polygon -1 true false 135 195 119 235 95 218 76 210 46 204 60 165 Polygon -1 true false 75 45 83 77 71 103 86 114 166 78 135 60 Polygon -7500403 true true 30 136 151 77 226 81 280 119 292 146 292 160 287 170 270 195 195 210 151 212 30 166 Circle -16777216 true false 215 106 30 flag false 0 Rectangle -7500403 true true 60 15 75 300 Polygon -7500403 true true 90 150 270 90 90 30 Line -7500403 true 75 135 90 135 Line -7500403 true 75 45 90 45 flower false 0 Polygon -10899396 true false 135 120 165 165 180 210 180 240 150 300 165 300 195 240 195 195 165 135 Circle -7500403 true true 85 132 38 Circle -7500403 true true 130 147 38 Circle -7500403 true true 192 85 38 Circle -7500403 true true 85 40 38 Circle -7500403 true true 177 40 38 Circle -7500403 true true 177 132 38 Circle -7500403 true true 70 85 38 Circle -7500403 true true 130 25 38 Circle -7500403 true true 96 51 108 Circle -16777216 true false 113 68 74 Polygon -10899396 true false 189 233 219 188 249 173 279 188 234 218 Polygon -10899396 true false 180 255 150 210 105 210 75 240 135 240 house false 0 Rectangle -7500403 true true 45 120 255 285 Rectangle -16777216 true false 120 210 180 285 Polygon -7500403 true true 15 120 150 15 285 120 Line -16777216 false 30 120 270 120 leaf false 0 Polygon -7500403 true true 150 210 135 195 120 210 60 210 30 195 60 180 60 165 15 135 30 120 15 105 40 104 45 90 60 90 90 105 105 120 120 120 105 60 120 60 135 30 150 15 165 30 180 60 195 60 180 120 195 120 210 105 240 90 255 90 263 104 285 105 270 120 285 135 240 165 240 180 270 195 240 210 180 210 165 195 Polygon -7500403 true true 135 195 135 240 120 255 105 255 105 285 135 285 165 240 165 195 line true 0 Line -7500403 true 150 0 150 300 line half true 0 Line -7500403 true 150 0 150 150 pentagon false 0 Polygon -7500403 true true 150 15 15 120 60 285 240 285 285 120 person false 0 Circle -7500403 true true 110 5 80 Polygon -7500403 true true 105 90 120 195 90 285 105 300 135 300 150 225 165 300 195 300 210 285 180 195 195 90 Rectangle -7500403 true true 127 79 172 94 Polygon -7500403 true true 195 90 240 150 225 180 165 105 Polygon -7500403 true true 105 90 60 150 75 180 135 105 plant false 0 Rectangle -7500403 true true 135 90 165 300 Polygon -7500403 true true 135 255 90 210 45 195 75 255 135 285 Polygon -7500403 true true 165 255 210 210 255 195 225 255 165 285 Polygon -7500403 true true 135 180 90 135 45 120 75 180 135 210 Polygon -7500403 true true 165 180 165 210 225 180 255 120 210 135 Polygon -7500403 true true 135 105 90 60 45 45 75 105 135 135 Polygon -7500403 true true 165 105 165 135 225 105 255 45 210 60 Polygon -7500403 true true 135 90 120 45 150 15 180 45 165 90 square false 0 Rectangle -7500403 true true 30 30 270 270 square 2 false 0 Rectangle -7500403 true true 30 30 270 270 Rectangle -16777216 true false 60 60 240 240 star false 0 Polygon -7500403 true true 151 1 185 108 298 108 207 175 242 282 151 216 59 282 94 175 3 108 116 108 target false 0 Circle -7500403 true true 0 0 300 Circle -16777216 true false 30 30 240 Circle -7500403 true true 60 60 180 Circle -16777216 true false 90 90 120 Circle -7500403 true true 120 120 60 tree false 0 Circle -7500403 true true 118 3 94 Rectangle -6459832 true false 120 195 180 300 Circle -7500403 true true 65 21 108 Circle -7500403 true true 116 41 127 Circle -7500403 true true 45 90 120 Circle -7500403 true true 104 74 152 triangle false 0 Polygon -7500403 true true 150 30 15 255 285 255 triangle 2 false 0 Polygon -7500403 true true 150 30 15 255 285 255 Polygon -16777216 true false 151 99 225 223 75 224 truck false 0 Rectangle -7500403 true true 4 45 195 187 Polygon -7500403 true true 296 193 296 150 259 134 244 104 208 104 207 194 Rectangle -1 true false 195 60 195 105 Polygon -16777216 true false 238 112 252 141 219 141 218 112 Circle -16777216 true false 234 174 42 Rectangle -7500403 true true 181 185 214 194 Circle -16777216 true false 144 174 42 Circle -16777216 true false 24 174 42 Circle -7500403 false true 24 174 42 Circle -7500403 false true 144 174 42 Circle -7500403 false true 234 174 42 turtle true 0 Polygon -10899396 true false 215 204 240 233 246 254 228 266 215 252 193 210 Polygon -10899396 true false 195 90 225 75 245 75 260 89 269 108 261 124 240 105 225 105 210 105 Polygon -10899396 true false 105 90 75 75 55 75 40 89 31 108 39 124 60 105 75 105 90 105 Polygon -10899396 true false 132 85 134 64 107 51 108 17 150 2 192 18 192 52 169 65 172 87 Polygon -10899396 true false 85 204 60 233 54 254 72 266 85 252 107 210 Polygon -7500403 true true 119 75 179 75 209 101 224 135 220 225 175 261 128 261 81 224 74 135 88 99 wheel false 0 Circle -7500403 true true 3 3 294 Circle -16777216 true false 30 30 240 Line -7500403 true 150 285 150 15 Line -7500403 true 15 150 285 150 Circle -7500403 true true 120 120 60 Line -7500403 true 216 40 79 269 Line -7500403 true 40 84 269 221 Line -7500403 true 40 216 269 79 Line -7500403 true 84 40 221 269 x false 0 Polygon -7500403 true true 270 75 225 30 30 225 75 270 Polygon -7500403 true true 30 75 75 30 270 225 225 270 @#$#@#$#@ NetLogo 5.1.0 @#$#@#$#@ setup @#$#@#$#@ @#$#@#$#@ @#$#@#$#@ @#$#@#$#@ default 0.0 -0.2 0 0.0 1.0 0.0 1 1.0 0.0 0.2 0 0.0 1.0 link direction true 0 Line -7500403 true 150 150 90 180 Line -7500403 true 150 150 210 180 @#$#@#$#@ 0 @#$#@#$#@