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Report
Dynamic games with hidden actions and hidden states
We consider a class of dynamic games in which each player?s actions are unobservable to the other players and each player?s actions can influence a state variable that is unobservable to the other players. We develop an algorithm that solves for the subset of sequential equilibria in which equilibrium strategies depend on private information only through the privately observed state.
Report
Re-examining the contributions of money and banking shocks to the U.S. Great Depression
This paper quantitatively evaluates the hypothesis that deflation can account for much of the Great Depression (1929?33). We examine two popular explanations of the Depression: (1) The ?high wage? story, according to which deflation, combined with imperfectly flexible wages, raised real wages and reduced employment and output. (2) The ?bank failure? story, according to which deflationary money shocks contributed to bank failures and to a reduction in the efficiency of financial intermediation, which in turn reduced lending and output. We evaluate these stories using general equilibrium ...
Working Paper
Finite memory and imperfect monitoring
Report
Efficient allocations with hidden income and hidden storage
We consider an environment in which individuals receive income shocks that are unobservable to others and can privately store resources. We provide a simple characterization of the efficient allocation in cases in which the rate of return on storage is sufficiently high or, alternatively, in which the worst possible outcome is sufficiently dire. We show that, unlike in environments without unobservable storage, the symmetric efficient allocation is decentralizable through a competitive asset market in which individuals trade risk-free bonds among themselves.
Journal Article
Zero nominal interest rates: why they're good and how to get them
This study shows that in a standard one-sector neoclassical growth model, in which money is introduced with a cash-in-advance constraint, zero nominal interest rates are optimal. Milton Friedman argued in 1969 that zero nominal rates are necessary for efficient resource allocation. This study shows that they are not only necessary but sufficient. The study also characterizes the monetary policies that will implement zero rates. The set of such policies is quite large. The only restriction these policies must satisfy is that asymptotically money shrinks at a rate no greater than the rate of ...
Report
The great U.K. depression: a puzzle and possible resolution
Between 1913 and 1929, real GDP per person in the UK fell 1 percent, while this same measure of economic activity rose about 25 percent in the rest of the world. Why was Britain so depressed in a decade of strong economic activity around the world? This paper argues that the standard explanations of contractionary monetary shocks and an overvalued nominal exchange rate are not the prime suspects for killing the British economy. Rather, we argue that large, negative sectoral shocks, coupled with generous unemployment benefits and housing subsidies, are the primary causes of this long and deep ...
Report
Self-fulfilling debt crises
We characterize the values of government debt and the debt's maturity structure under which financial crises brought on by a loss of confidence in the government can arise within a dynamic, stochastic general equilibrium model. We also characterize the optimal policy response of the government to the threat of such a crisis. We show that when the country's fundamentals place it inside the crisis zone, the government is motivated to reduce its debt and exit the crisis zone because this leads to an economic boom and a reduction in the interest rate on the government's debt. We show that this ...
Working Paper
Implications of heterogeneity in preferences, beliefs and asset trading technologies for the macroeconomy
This paper analyzes and computes the equilibria of economies with large numbers of heterogeneous agents who have different asset trading technologies, preferences, and beliefs. We illustrate the value of our method by using it to evaluate the implications of these heterogeneities through several quantitative exercises.
Report
Can the Mortonson-Pissarides matching model match the business cycle facts?
We examine whether the Mortensen-Pissarides matching model can account for the business cycle facts on employment, job creation, and job destruction. A novel feature of our analysis is its emphasis on the reduced-form implications of the matching model. Our main finding is that the model can account for the business cycle facts, but only if the average duration of a nonemployment spell is relatively high?about nine months or longer.
Report
Efficient non-contractible investments
This paper addresses the question of whether agents will invest efficiently in attributes that will increase their productivity in subsequent matches with other individuals. We present a two-sided matching model in which buyers and sellers make investment decisions prior to a matching stage. Once matched, the buyer and seller bargain over the transfer price. In contrast to most matching models, preferences over possible matches are affected by decisions made before the matching process. We show that if bargaining respects the existence of outside options (in the sense that the resulting ...