treatment "prisoners-dilemma.ztt"{ background{ table globals{ } table subjects{ } table summary{ } table contracts{ } table clients{ } table treatments{ } table sessionglobals{ } table participations{ } numsubjects = 2; numgroups = 1; numpracticeperiods = 0; numactualperiods = 1; exchangerate = 1; startendowment = 0; showupfee = 0; noAutoscope = FALSE; firstBoxesOnTop = FALSE; showupfeeawaytext = "You are making losses. Do you want to invest the showupfee in order to continue?"; showupfeeawayyestext = "Yes"; showupfeeawaynotext = "No"; moneyawaytext = "You are making losses. Do you want to continue?"; moneyawayyestext = "Yes"; moneyawaynotext = "No"; bancruptwaittext = "Please wait until the experimenter unlocks your PC."; program{ table = subjects; do{ // My payoff, by my choice and the other's. BothCooperate = 200; BothDefect = 100; DefectAlone = 300; CooperateAlone = 0; } } screen action{ usesbg = TRUE; withalertscreen = FALSE; noalertscreen = FALSE; headerbox "Header"{ hasframe = TRUE; height = 10%; top = 0p; cuttop = TRUE; showPeriods = TRUE; showNumPeriods = TRUE; periodtext = "Period"; periodoftext = "of"; practiceperiodprefix = "Trial "; showtime = TRUE; timestr = "Remaining time [sec]:"; pleasedecidetext = "Please reach a decision."; } } screen wait{ usesbg = TRUE; withalertscreen = FALSE; noalertscreen = FALSE; standardbox "Text"{ hasframe = TRUE; buttonposition = BOTTOMRIGHT; buttonsequence = HORIZONTAL; item{ label = "Please wait until the experiment continues."; } } } } stage "Decision"{ startwaitforall = TRUE; startConditionStr = ""; singleentry = FALSE; singleentrycontinuation = FALSE; timeouttype = ifnoinput; timeout = 60; screen action{ usesbg = TRUE; withalertscreen = FALSE; noalertscreen = FALSE; standardbox "Decision"{ hasframe = TRUE; buttonposition = BOTTOMRIGHT; buttonsequence = HORIZONTAL; item{ label = "You and the other player each choose to cooperate or to defect. Your payoffs (yours, the other's):"; } item{ label = "both cooperate: 200, 200. You cooperate, the other defects: 0, 300."; } item{ label = "You defect, the other cooperates: 300, 0. Both defect: 100, 100."; } item{ } item{ label = "Your choice"; variable = Cooperate; format = "!radio: 0=\"Defect\"; 1=\"Cooperate\";"; input = TRUE; showdefault = FALSE; emptyallowed = FALSE; min = 0; max = 1; } button "OK"{ clearinputafterok = FALSE; norecordmadeorselected = FALSE; terminatestage = FALSE; donotterminatestage = FALSE; specialbuttoncolor = FALSE; buttoncolor = 0; } } } screen wait{ usesbg = TRUE; withalertscreen = FALSE; noalertscreen = FALSE; } } stage "Results"{ startwaitforall = TRUE; startConditionStr = ""; singleentry = FALSE; singleentrycontinuation = FALSE; timeouttype = ifnoinput; timeout = 30; program{ table = subjects; do{ OtherCooperate = find(same(Group) & not(same(Subject)), Cooperate); Profit = if(Cooperate == 1, if(OtherCooperate == 1, BothCooperate, CooperateAlone), if(OtherCooperate == 1, DefectAlone, BothDefect)); } } screen action{ usesbg = TRUE; withalertscreen = FALSE; noalertscreen = FALSE; standardbox "Results"{ hasframe = TRUE; buttonposition = BOTTOMRIGHT; buttonsequence = HORIZONTAL; item{ label = "You chose to"; variable = Cooperate; format = "!text: 1=\"cooperate\"; 0=\"defect\";"; input = FALSE; } item{ label = "The other player chose to"; variable = OtherCooperate; format = "!text: 1=\"cooperate\"; 0=\"defect\";"; input = FALSE; } item{ label = "Your payoff"; variable = Profit; format = "1"; input = FALSE; } button "Continue"{ clearinputafterok = FALSE; norecordmadeorselected = FALSE; terminatestage = FALSE; donotterminatestage = FALSE; specialbuttoncolor = FALSE; buttoncolor = 0; } } } screen wait{ usesbg = TRUE; withalertscreen = FALSE; noalertscreen = FALSE; } } roles{ role "S 1"{ } role "S 2"{ } } period "1"{ prompt = ""; subject 1{ name = ""; group = 1; do{ Player = 1; } } subject 2{ name = ""; group = 1; do{ Player = 2; } } } }