In this paper we have developed a general model of borrowing constraints based on the idea of limited enforcement. I our model, borrowing constraints arise as part of the optimal borrowing and lending contract. Our model extends previous theories of borrowing and lending , such as Hart and Moore...

Working in a complete-markets setting, a property of asset demands in identified that is inconsistent with the investor's preference being based on probabilities. In this way, a market counterpart of the Ellsberg Paradox is provided.

A prototypical vintage capital model of economic growth is developed, where the decision to replace old technologies with new ones is modeled explicitly. Technological change is investment specific. Depreciation in this environment is an economic , not a physical concept.

This is a specific investigation of the importance of technological change specific to new investment goods for postwar U.S. aggregate fluctuations. A growth model that incorporates this form of technological change is calibrated to U.S. data and simulated, using the relative price of new...