This paper presents results from a 1971 natural experiment carried out by the Canadian government on the unemployment insurance system. At that time they dramatically increased the generosity of the system. We find that the propensity to collect UI increases with a first time exposure to the...

In standard shirking models of efficiency wages, workers are motivated only by high wages. Yet 23% of young US workers report receiving some form of performance pay. This paper extends the efficiency wage framework using the theory of self-enforcing agreements to allow for performance pay in the...

Gift giving is a practice common to many societies. In an evolutionary model the social custom of giving gifts at the beginning of a relationship can lead to trust and cooperation. The evolutionary approach makes predictions about the character of the goods that can be used as gifts. For...

This paper introduces a model of contract incompleteness and bounded rationality based on the multi-tasking model of Holmstrom and Milgrom (1991). It is shown that the trade-off between the use of an employment relationship versus and explicit state contingent contract depends on number of tasks...

We examine an evolutionary model of preferences in a society where resources are finite. Agents who develop better strategies for bargaining and trading will grow to dominate the population. We show that successful agents will have preferences that exhibit the "endowment effect". The social...

This paper discusses the literature on the enforcement of incomplete contracts. It compares legal enforcement to enforcement via relationships and reputations. A number of mechanisms, such as the repeat purchase mechanism (Klein and Leffler (1981)) and efficiency wages (Shapiro and Stiglitz...