Cooperation and Altruism in One-Shot Prisoners' Dilemma Games

Reputation and Increased Cooperation in Repeated Prisoners' Dilemma Games

Interpreting Experimental Game Results

An economist designs a study where two anonymous participants, who will only interact once, must independently choose one of two actions: 'Action A' or 'Action B'. The outcomes are set up so that choosing 'Action B' always yields a higher personal payoff for an individual, regardless of the other participant's choice. However, if both participants choose 'Action A', they each receive a better payoff than if they both choose 'Action B'. What is the primary research question this experimental desi

Theoretical Predictions vs. Experimental Observations

An economist conducts a study where participants play a game with a partner. In the game, each player can choose to either 'cooperate' or 'not cooperate'. The payoffs are structured such that not cooperating always yields a higher individual reward for that round, regardless of the partner's choice, but mutual cooperation leads to a better outcome for both than mutual non-cooperation. The study compares two conditions:

• Condition 1: Participants play the game only once with an anonymous pa

Critiquing an Experimental Design

Designing an Experiment to Test a Hypothesis

An economist studies a game where two individuals can either 'cooperate' or 'defect'. Defecting always yields a higher personal payoff for that round, but mutual cooperation is better for both than mutual defection. Match each experimental condition below with the primary factor that would explain a player's decision to cooperate in that scenario.

An economist observes that in a one-time, anonymous interaction where two participants can choose to either 'cooperate' or 'defect', a certain percentage of participants choose to 'cooperate'. If the experiment is modified so that participants are first shown a brief, neutral video of their anonymous partner, economic theory predicts this change will decrease the rate of cooperation.

Predicting Experimental Outcomes in a Cooperation Game

An economist conducts an experiment where pairs of anonymous participants play a game one time. In this game, each player can choose to either 'cooperate' or 'defect'. Defecting always provides a higher individual payoff for that round, but if both players cooperate, they achieve a better outcome than if they both defect. The experiment has three conditions:

• Condition 1 (Control): Participants are given no information about their partner. The cooperation rate is 25%.
• **Condition 2 (In-Gr

An economist conducts a study where participants play a game with a partner. In the game, each player can choose to either 'cooperate' or 'not cooperate'. The payoffs are structured such that not cooperating always yields a higher individual reward for that round, regardless of the partner's choice, but mutual cooperation leads to a better outcome for both than mutual non-cooperation. The study compares two conditions:

• Condition 1: Participants play the game only once with an anonymous pa

Theoretical Predictions vs. Experimental Observations