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Correlated Disturbances and U.S. Business Cycles

  • Cúrdia, Vasco
  • Reis, Ricardo

The dynamic stochastic general equilibrium (DSGE) models that are used to study business cycles typically assume that exogenous disturbances are independent autoregressions of order one. This paper relaxes this tight and arbitrary restriction, by allowing for disturbances that have a rich contemporaneous and dynamic correlation structure. Our first contribution is a new Bayesian econometric method that uses conjugate conditionals to make the estimation of DSGE models with correlated disturbances feasible and quick. Our second contribution is a re-examination of U.S. business cycles. We find that allowing for correlated disturbances resolves some conflicts between estimates from DSGE models and those from vector autoregressions, and that a key missing ingredient in the models is countercyclical fiscal policy. According to our estimates, government spending and technology disturbances play a larger role in the business cycle than previously ascribed, while changes in markups are less important.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 7712.

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Date of creation: Feb 2010
Date of revision:
Handle: RePEc:cpr:ceprdp:7712
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