from otree.api import * c = cu doc = '\nThis is a standard 2-player trust game where the amount sent by player 1 gets\ntripled. The trust game was first proposed by\n\n Berg, Dickhaut, and McCabe (1995)\n.\n' class C(BaseConstants): NAME_IN_URL = 'trustPT' PLAYERS_PER_GROUP = 2 NUM_ROUNDS = 1 ENDOWMENT = cu(1000) MULTIPLIER = 3 INSTRUCTIONS_TEMPLATE = 'trustPT/instructions.html' class Subsession(BaseSubsession): pass class Group(BaseGroup): sent_amount = models.CurrencyField(doc='Amount sent by P1', label='Por favor, escolha um valor entre 0 e 1000.', max=C.ENDOWMENT, min=0) sent_back_amount = models.CurrencyField(doc='Amount sent back by P2', label='Por favor, escolha um valor.', min=0) def sent_back_amount_max(group: Group): return group.sent_amount * C.MULTIPLIER def set_payoffs(group: Group): p1 = group.get_player_by_id(1) p2 = group.get_player_by_id(2) p1.payoff = C.ENDOWMENT - group.sent_amount + group.sent_back_amount p2.payoff = group.sent_amount * C.MULTIPLIER - group.sent_back_amount class Player(BasePlayer): pass def custom_export(players): yield ['participant_code', 'id_in_group'] for p in players: pp = p.participant yield [pp.code, p.id_in_group] class Send(Page): form_model = 'group' form_fields = ['sent_amount'] @staticmethod def is_displayed(player: Player): group = player.group return player.id_in_group == 1 class SendBackWaitPage(WaitPage): pass class SendBack(Page): form_model = 'group' form_fields = ['sent_back_amount'] @staticmethod def is_displayed(player: Player): group = player.group return player.id_in_group == 2 @staticmethod def vars_for_template(player: Player): group = player.group tripled_amount = group.sent_amount * C.MULTIPLIER return dict(tripled_amount=tripled_amount) class ResultsWaitPage(WaitPage): after_all_players_arrive = set_payoffs class Results(Page): form_model = 'player' @staticmethod def vars_for_template(player: Player): group = player.group return dict(tripled_amount=group.sent_amount * C.MULTIPLIER) page_sequence = [Send, SendBackWaitPage, SendBack, ResultsWaitPage, Results]