Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We test whether the length of an indefinite horizon, or that the horizon is indefinite as opposed to finite, affects cooperation in repeated 3×3Red Queen Games. With our participant population, and our experimental program and procedures, the length of the indefinite horizon significantly affects cooperation in the Prisoner’s Dilemma. It also significantly affects cooperation in the Red Queen Game, but only after participants are experienced. The indefiniteness of the horizon does not significantly affect cooperation in either game. Our results highlight the importance of experience for cooperation in indefinite games with even slightly larger strategy spaces than the Prisoner’s Dilemma.