We experimentally show that current models of reciprocity are in-complete in a systematic way using a new variant of the ultimatumgame that provides second-movers with a marginal-cost-free punish-ment option. For a substantial proportion of the population, the de-gree of first-mover unkindness...

For given product specifications by two competing firms the demand levels are determined by a randomly generated ideal composition of aspects. Firms can vary some or all aspects of these products, based on information about own (and other's) previous demand. Although the product space is much...