This paper studies whether fiscal policy satisfies a borrowing constraint. Direct tests of the present-value constraint are rare, despite widespread discussion of the feasibility of current policy. We examine monthly data on Canadian federal government finances using tests for cointegration. We...

Extreme market outcomes are often followed by a lack of liquidity and a lack of trade. This market collapse seems particularly acute for markets where traders rely heavily on a specific empirical model such as in derivative markets like the market for mortgage backed securities or credit...

Recent developments in intertemporal asset pricing theory focus on two sets of fundamental determinants of asset returns. Models with complete markets emphasize aggregate variables such as per capita consumption. Such models have not performed well empirically. Models with incomplete markets...

The paper investigates portfolio strategies and derivative market making when the trader does not know the correct model. One of the puzzles from last summer's LTCM collapse was that when the Russian government defaulted, liquidity dried up. Antidotal evidence suggests that people were unable to...

We inject aggregate uncertainty - risk and ambiguity - into an otherwise standard business cycle model and describe its consequences. We find that increases in uncertainty generally reduce consumption, but they do not account, in this model, for either the magnitude or the persistence of the...

that central banks incur for implementing Taylor rule type policies.

Identification problems arise naturally in forward-looking models when agents observe more than economists. We illustrate the problem in several macro-finance models with Taylor rules. When the shock to the rule is observed by agents but not economists, identification of the rule's parameters...