We introduce learning based on genetic algorithms in a principal-agent model of optimal contracting under moral hazard. Applications of this setting abound in finance (credit under moral hazard), public finance (optimal taxation, information-constrained insurance), development (sharecropping),...

We analyze a version of Akerlof's market for lemons in which a sequence of buyers make offers to a long-lived seller endowed with a single unit for sale. We consider both the case in which previous offers are observable and the case in which they are not. When offers are observable, trade may...

The quintessential crime of the information age is identity theft, the malicious use of personal identifying data. In this paper we provide a model of “identity†and its use in credit transactions. In the environments we construct, various types of identity theft occur in equilibrium,...

In many economic contexts, especially signaling and search models, agents care about the distribution of other agents around them. Because of this, firms arise which produce neither goods nor services, but local “ponds†of agents. Such firms derive their attractiveness through the...

We consider an economy where trade is decentralized and agents have incomplete information with respect to the value of money. Agents' learning evolves from private experiences and we explore how the formation of prices interacts with learning. We show that multiple equilibria arise, and...

We introduce and solve a new class of static portfolio choice problems, where only the best realized alternative matters. A decision maker must simultaneously choose among independent ranked options, and the better alternatives have a lower chance of panning out. Each choice is costly, and just...

In developing economies, substantial economic activity takes place in the informal labor market, beyond the reach of government policy. Labor market policies, which by definition apply only to the formal-sector labor market, then have important spillover effects. The relative sizes of the...

Firms often offer menus of two-part tariffs to price discriminate among consumers with heterogeneous preferences. In this paper we study the effectiveness of this screening mechanism when consumers are uncertain about the quality of the good and resolve this uncertainty through consumption...

Standard RBC models predict forecastable movements in output, consumption and hours that differ from those obtained from a VAR estimated on US data. The paper investigates whether introducing bounded rationality and learning generates business cycles properties which are empirically plausible....

Asset markets are characterized by slow booms and sudden crashes. Lending rates, for example, are more likely to experience big jumps rather than big drops. We focus on the comparison of this pattern across countries. First, we document that lending rates are more asymmetric on economies with...