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...

This paper provides an argument for the advantage of a preference for identity-consistent behaviour from an evolutionary point of view. Within a stylised model of social interaction, we show that the development of cooperative social norms is greatly facilitated if the agents of the society...

In this experimental study, involving subjects from Abu-Dis (West Bank), Chengdu (China), Helsinki (Finland), and Jerusalem (Israel), we test for a presentation bias in a two-person cooperation game. In the positive frame of the game, a transfer creates a positive externality for the opposite...