IInnovative start-ups and venture capitalists are highly clustered: Silicon Valley is probably the best-known example. Clusters differ in the contracts they use, and in how they perform. I explore the link between spillovers, contractual design and performance. I find that more "incomplete"...

Standard economic models with complete information predict a positive, monotonic relationship between pay and performance. This prediction does not always hold in experimental tests: offering a small payment may result in lower performance than not offering any pay- ment. We test experimentally...

We study individual ability to memorize and recall information about friendship networks using a combination of experiments and survey-based data. In the experi- ment subjects are shown a network, in which their location is exogenously assigned, and they are then asked questions about the...

Contractual execution generates hard information, available to the contracting parties, even when contracts are secretly executed. Building on this simple observation, the paper shows that incomplete contracts can be preferred to complete contracts. This is because (i) execution of incomplete...

We develop a theory of the emergence of merchant guilds as an efficient mechanism to foster cooperation between merchants and rulers, building on the natural complementarity between merchants’ market trading and mutual monitoring. Unlike existing models, we focus on local merchant guilds,...

The available evidence from numerous studies in psychology suggests that overconfidence is a much more important phenomenon in North America than in Japan. Relatedly, North Americans appear to view high self-esteem much more positively than Japanese. The pattern is reversed when it comes to...