We consider mixed populations (N=21) of genuine (humans) and artificial (robots) agents, repeatedly interacting in small groups whose composition is changed randomly from round to round. Our purpose is to study the spread of cooperative or non-cooperative behavior in the population over time by...

While there is an extensive literature on the theory of infinitely repeated games, empirical evidence on how %22the shadow of the future%22 affects behavior is scarce and inconclusive. We simulate infinitely repeated prisoner's dilemma games in the lab by having a random continuation rule. The...

Case studies of cartels and recent theory suggest that repeated communication is key for stable cooperation in environments where signals about others' actions are noisy. However, empirically the exact role of communication is not well understood. We study cooperation under different monitoring...

This paper studies the interaction of beliefs, payoff parameters, and the cooperation rate in the infinitely repeated prisoner's dilemma. We show formally that a player's belief about the probability of cooperation by their opponent moderates the effect of changes in the payoff parameters on...

Case studies of cartels and recent theory suggest that repeated communication is key for stable cooperation in environments where signals about others' actions are noisy. However, empirically the exact role of communication is not well understood. We study cooperation under different monitoring...

A growing body of literature in experimental economics examines how cognitive ability affects cooperation in social dilemma settings. We contribute to the existing literature by studying this relationship in a more complex and strategic environment when the number of partners increases in an...

A growing body of literature in experimental economics examines how cognitive ability affects cooperation in social dilemma settings. We contribute to the existing literature by studying this relationship in a more complex and strategic environment when the number of partners increases in an...

An infinite-horizon perfect-information "centipede" game is studied. The unique subgame-perfect Nash equilibrium (SPNE) in pure strategies has each player choose, at each opportunity, to terminate the game. In contrast, mixed strategies can yield equilibrium cooperation described as follows: for...

I experimentally investigate a new game that modifies the prisoner's dilemma. In this game, as opposed to the regular prisoner's dilemma, there is no tradeoff between cooperation and strategic risk (uncertainty regarding the other player's strategy) that is the leading explanation for low...

This paper studies how competition between groups affects cooperation. In the control condition, pairs of subjects play an indefinitely repeated Prisoner's Dilemma game without external competition. In the treatment, two pairs compete against each other. No monetary rewards are tied to winning,...