This paper reports data from an ultimatum mini-game in which responders first had to choose whether or not to participate. Participation was costly, but the participation cost was smaller than the minimum payoff that a responder could guarantee himself in the ultimatum game. Compared to a...

How do people trade off efficiency against equality concerns? To study this question, we conducted a modified mini ultimatum game (N=120) in which proposers were asked to choose between offering 8:2 and y:y, y∈{5, 4.5, 4,.., 0.5}; all offers in Euro. According to the data, 58 of 60 proposers...

We experimentally investigate multiple notions of equity in ultimatum bargaining with asymmetric outside options. Building on the generalized equity principle formulated by Selten (1978), we derive three different equity rules that can explain 43% of all offers. Our within-subject design further...

Using a unique experimental data set, we investigate how asymmetric legal rights shape bargainers’ aspiration levels through moral entitlements derived from equity norms and number prominence. Aspiration formation is typically hard to observe in real life. Our study involves 15 negotiations...