Local merchant guilds were ubiquitous in medieval Europe, and their development was inextricably linked with the development of towns and the rise of the merchant class. We develop a theory of the emergence of local merchant guilds as an efficient mechanism to implement collusion among merchants...

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...

This paper explores a new role for venture capitalists, as knowledge intermediaries. A venture capital investor can communicate valuable knowledge to an entrepreneur, facilitating innovation. The venture capitalist can also communicate the entrepreneur's innovative knowledge to other portfolio...

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

Innovative start-ups and venture capitalists are highly clustered, benefiting from localized spillovers: Silicon Valley is perhaps the best example. There is also substantial geographical variation in venture capital contracts: California contracts are more 'incomplete'. This paper explores the...

Evidence from psychology suggests that overconfidence is more important in North America than in Japan. The pattern is reversed for shame, an emotion that appears to play a more important role among Japanese than North Americans. We develop a model that endogenizes these differences, building on...