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Perturbation Methods for Markov-Switching DSGE Models

  • Foerster, Andrew
  • Rubio-Ramírez, Juan Francisco
  • Waggoner, Daniel F
  • Zha, Tao

This paper develops a general perturbation methodology for constructing high-order approximations to the solutions of Markov-switching DSGE models. We introduce an important and practical idea of partitioning the Markov-switching parameter space so that a steady state is well defined. With this definition, we show that the problem of definding an approximation of any order can be reduced to solving a system of quadratic equations. We propose using the theory of Grobner bases in searching all the solutions to the quadratic system. This approach allows us to obtain all the approximations and ascertain how many of them are stable. Our methodology is applied to three models to illustrate its feasibility and practicality.

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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 9464.

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Date of creation: May 2013
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Handle: RePEc:cpr:ceprdp:9464
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