Standard economic explanations of good conduct in trade rely almost exclusively on future-directed extrinsic motivations induced by material incentives. But intrinsic motives to behave trustworthily and to punish untrustworthiness do support trade. In our model, intrinsically motivated players...

Although one may hope to achieve equality of stated profits without enforcing it, one may not trust in such voluntary equality seeking and rather try to impose rules (of bidding) guaranteeing it. Our axiomatic approach is based on envy-free net trades according to bids, which, together with the...

The paper studies theoretically how the optimal contract in the hidden-action moral-hazard model is affected when an agent feels bad when not reaching a target effort set in the contract. In equilibrium, the agent's effort falls short of the target, inducing guilt, which must be compensated by a...

Even if contract enforcers are as opportunistic as ordinary traders, a system of adjudication can increase the degree to which contractual obligations on large anonymous markets are fulfilled. Only if arbitrators receive a fixed income, occasional mistakes will not favour the untrustworthy. It...