AEA RCT Registry

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Field	Before	After
Last Published	September 08, 2022 12:38 PM	November 17, 2022 04:06 AM
Intervention (Public)	The aim of the experiment is to test for our new game, the courtesy game, if participants play the weakly dominant strategy of the game. We designed a simultaneous, two players, two strategies basic version of the game. We run two treatments: • Repeated: Participants play 10 rounds of the game in groups of two under a perfect stranger matching with feedback after each round. • One shot: Participants play one round of the game in groups of two under with direct feedback.	The aim of the experiment is to test for our new game, the courtesy game, if participants play the weakly dominant strategy of the game. We designed a simultaneous, two players, two strategies basic version of the game. We run two treatments: • Repeated: Participants play 10 rounds of the game in groups of two under a perfect stranger matching with feedback after each round. • One shot: Participants play one round of the game in groups of two under with direct feedback. We additionally run the following treatment: • Repeated Partner: Participants play 10 rounds of the game in groups of two under a partner matching with feedback after each round.
Experimental Design (Public)	The laboratory experiment will be programmed in oTree (Chen et al. 2016) and conducted with participants of the University of Hamburg. Participants will read the instructions on screen and are requested to answer control questions before proceeding with the experiment. Participants play 10 rounds (1 round in treatment one shot) of the game under a complete stranger matching in groups of two. Participants are informed of the matching procedure in the instructions. In each round, participants have to decide between strategy X or Y. After each round, participants receive feedback. Before each round, participants are asked to state their belief what strategy choice (X or Y) the other player in this round will make. This belief request is unincentivised. In the post-experimental questionnaire, we ask participants for: • gender, age, field of study, • risk, courtesy and patience attitudes, • motives (payoff maximization, altruism, inequality aversion, efficiency or envy) behind their decisions in the experiment. Further design details: • Complete Stranger Matching • On an individual level, the display of strategies in the payoff matrix (XY or YX) is randomized between subjects. • Feedback after each round: Own strategy choice, strategy choice of the other player, own payoff for the respective round, payoff of the other player for the respective round • Feedback at the end of the experiment: Own accumulated payoff	The laboratory experiment will be programmed in oTree (Chen et al. 2016) and conducted with participants of the University of Hamburg. Participants will read the instructions on screen and are requested to answer control questions before proceeding with the experiment. Participants play 10 rounds (1 round in treatment one shot) of the game under a complete stranger matching in groups of two. Participants are informed of the matching procedure in the instructions. In each round, participants have to decide between strategy X or Y. After each round, participants receive feedback. Additionally, in treatment ‘repeated partner’, participants play 10 rounds of the game under a partner matching in groups of two. Participants are informed of the matching procedure in the instructions. In each round, participants have to decide between strategy X or Y. After each round, participants receive feedback. Before each round, participants are asked to state their belief what strategy choice (X or Y) the other player in this round will make. This belief request is unincentivised. In the post-experimental questionnaire, we ask participants for: • gender, age, field of study, • risk, courtesy and patience attitudes, • motives (payoff maximization, altruism, inequality aversion, efficiency or envy) behind their decisions in the experiment. Further design details: • Complete Stranger Matching • Partner Matching • On an individual level, the display of strategies in the payoff matrix (XY or YX) is randomized between subjects. • Feedback after each round: Own strategy choice, strategy choice of the other player, own payoff for the respective round, payoff of the other player for the respective round • Feedback at the end of the experiment: Own accumulated payoff
Randomization Method	Randomization (perfect stranger matching and randomization of strategies within the payoff matrix) is done by a computer program (oTree).	Randomization (perfect stranger matching, partner matching and randomization of strategies within the payoff matrix) is done by a computer program (oTree).
Randomization Unit	Individual level (randomization of strategies within the payoff matrix). Experimental session level (perfect stranger matching).	Individual level (randomization of strategies within the payoff matrix). Experimental session level (perfect stranger and partner matching).
Planned Number of Clusters	2 sessions à 24 participants for the repeated game (one treatment). 1 session à 24 participants for the one shot game (one treatment).	2 sessions à 24 participants for the repeated game (one treatment). 1 session à 24 participants for the one shot game (one treatment). Additionally: 2 session à 24 participants for the repeated game – partner matching.
Planned Number of Observations	2 sessions x 24 participants x 10 rounds = 480 individual observations for the repeated game, respectively 240 group observations (one group = 2 participants). 1 session x 24 participants x 1 round = 24 individual observations for the one shot game, respectively 12 group observations (one group = 2 participants).	2 sessions x 24 participants x 10 rounds = 480 individual observations for the repeated game, respectively 240 group observations (one group = 2 participants). 1 session x 24 participants x 1 round = 24 individual observations for the one shot game, respectively 12 group observations (one group = 2 participants). Additionally: 2 sessions x 24 participants x 10 rounds = 480 individual observations for the repeated game (partner matching), respectively 24 group observations (one group = 2 participants in 10 rounds).
Sample size (or number of clusters) by treatment arms	48 participants in 2 sessions for the repeated game (one treatment). 24 participants in 1 session for the one shot game (one treatment).	48 participants in 2 sessions for the repeated game (one treatment). 48 participants in 2 sessions for the repeated game – partner matching (one treatment). 24 participants in 1 session for the one shot game (one treatment).