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Working Paper
A tractable circular city model with an application to the effects of development constraints on land rents
Superseded by working paper 13-37.> A tractable production-externality-based circular city model in which both firms and workers choose location as well as intensity of land use is presented. The equilibrium structure of the city has either (i) no commuting ("mixed-use" form) or (ii) a central business district (CBD) of positive radius and a surrounding residential ring. Regardless of which form prevails, the intra-city variation in all endogenous variables displays the negative exponential form: x(r) = x(0)exr (where r is the distance from the city center and x depends only on preference ...
Working Paper
Entry and exit, product variety and the business cycle
Working Paper
Spinoffs and the market for ideas
We present a theory of spinoffs in which the key ingredient is the originator?s private information concerning the quality of his new idea. Because quality is privately observed, by the standard adverse-selection logic, the market can at best offer a price that reflects the average quality of ideas sold. This gives the holders of above-average-quality ideas the incentive to spin off. We show that only workers with very good ideas decide to spin off, while workers with mediocre ideas sell them. Entrepreneurs of existing firms pay a price for the ideas sold in the market that implies zero ...
Working Paper
Foreclosures and house price dynamics: a quantitative analysis of the mortgage crisis and the foreclosure prevention policy
This paper is superseded by WP 15-15 <p>The authors construct a quantitative equilibrium model of the housing market in which an unanticipated increase in the supply of housing triggers default mortgages via its effect on house prices. The decline in house prices creates an incentive to increase the consumption of housing space, but leverage makes it costly for homeowners to sell their homes and buy bigger ones (they must absorb large capital losses). Instead, leveraged households find it advantageous to default and rent housing space. Since renters demand less housing space than homeowners, ...
Working Paper
Urban density and the rate of invention
Economists, beginning with Alfred Marshall, have studied the significance of cities in the production and exploitation of information externalities that, today, we call knowledge spillovers. This paper presents robust evidence of those effects. We show that patent intensity?the per capita invention rate?is positively related to the density of employment in the highly urbanized portion of MAs. All else equal, a city with twice the employment density (jobs per square mile) of another city will exhibit a patent intensity (patents per capita) that is 20 percent higher. Patent intensity is ...
Working Paper
A neoclassical model of seasonal fluctuations
Working Paper
A Quantitative Theory of the Credit Score
What is the role of credit scores in credit markets? We argue that it is a stand in for a market assessment of a person's unobservable type (which here we take to be patience). We pose a model of persistent hidden types where observable actions shape the public assessment of a person's type via Bayesian updating. We show how dynamic reputation can incentivize repayment without monetary costs of default beyond the administrative cost of filing for bankruptcy. Importantly we show how an economy with credit scores implements the same equilibrium allocation. We estimate the model using both ...
Working Paper
Monetary and financial forces in the Great Depression
What caused the worldwide collapse in output from 1929 to 1933? Why was the recovery from the trough of 1933 so protracted for the U.S.? How costly was the decline in terms of welfare? Was the decline preventable? These are some of the questions that have motivated economists to study the Great Depression. In this paper, the authors review some of the economic literature that attempts to answer these questions.
Working Paper
Incumbency Disadvantage in U.S. National Politics: The Role of Policy Inertia and Prospective Voting
We document that postwar U.S. national elections show a strong pattern of incumbency disadvantage": If the presidency has been held by a party for some time, that party tends to lose seats in Congress. We develop a model of partisan politics with policy inertia and prospective voting to explain this finding. Positive and normative implications of the model are explored.
Working Paper
A Quantitative Theory of the Credit Score
What is the role of credit scores in credit markets? We argue that it is a stand-in for a market assessment of a person’s unobservable type (which here we take to be patience). We pose a model of persistent hidden types where observable actions shape the public assessment of a person’s type via Bayesian updating. We show how dynamic reputation can incentivize repayment without monetary costs of default beyond the administrative cost of filing for bankruptcy. Importantly, we show how an economy with credit scores implements the same equilibrium allocation. We estimate the model using both ...