Perverse Effects of Unfulfilled Norms: A Look at the Roots of Favoritism

In four experiments, 120 subjects had to judge and reward the performance of players in a game. When no player fulfilled the norm of the game, subjects gave rewards arbitrarily or favored their friends among the players; when some players fulfilled the norm of the game, subjects made fair judgments, rewarding the players who fulfilled the norm, and they did not favor their friends. These findings suggest that research on in-group favoritism should include a serious discussion of the formal norms that regulate people's decisions when they have to allocate rewards.