63 lines
1.5 KiB
Python
63 lines
1.5 KiB
Python
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from otree.api import (
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models,
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widgets,
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BaseConstants,
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BaseSubsession,
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BaseGroup,
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BasePlayer,
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Currency as c,
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currency_range,
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)
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doc = """
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This is a standard 2-player trust game where the amount sent by player 1 gets
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tripled. The trust game was first proposed by
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<a href="http://econweb.ucsd.edu/~jandreon/Econ264/papers/Berg%20et%20al%20GEB%201995.pdf" target="_blank">
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Berg, Dickhaut, and McCabe (1995)
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</a>.
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"""
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class Constants(BaseConstants):
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name_in_url = 'trust'
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players_per_group = 2
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num_rounds = 1
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instructions_template = 'trust/instructions.html'
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# Initial amount allocated to each player
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endowment = c(100)
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multiplier = 3
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class Subsession(BaseSubsession):
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pass
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class Group(BaseGroup):
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sent_amount = models.CurrencyField(
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min=0, max=Constants.endowment, doc="""Amount sent by P1"""
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)
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sent_back_amount = models.CurrencyField(doc="""Amount sent back by P2""", min=c(0))
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def sent_back_amount_max(self):
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return self.sent_amount * Constants.multiplier
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def set_payoffs(self):
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p1 = self.get_player_by_id(1)
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p2 = self.get_player_by_id(2)
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p1.payoff = Constants.endowment - self.sent_amount + self.sent_back_amount
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p2.payoff = self.sent_amount * Constants.multiplier - self.sent_back_amount
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class Player(BasePlayer):
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# def role(self):
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# return {1: 'A', 2: 'B'}[self.id_in_group]
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def role(self):
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if self.id_in_group == 1:
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return 'trustor'
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if self.id_in_group == 2:
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return 'trustee'
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