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Ensuring the Validity of the Micro Foundation in DSGE Models

  • Martin Møller Andreasen


    (School of Economics and Management, University of Aarhus, Denmark and CREATES)

The presence of i) stochastic trends, ii) deterministic trends, and/or iii) stochastic volatility in DSGE models may imply that the agents' objective functions attain infinite values. We say that such models do not have a valid micro foundation. The paper derives sufficient conditions which ensure that the objective functions of the households and the firms are finite even when various trends and stochastic volatility are included in a standard DSGE model. Based on these conditions we test the validity of the micro foundation in six DSGE models from the literature. The models of Justiniano & Primiceri (American Economic Review, forth-coming) and Fernández-Villaverde & Rubio-Ramírez (Review of Economic Studies, 2007) do not satisfy these sufficient conditions, or any other known set of conditions ensuring finite values for the objective functions. Thus, the validity of the micro foundation in these models remains to be established.

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Paper provided by School of Economics and Management, University of Aarhus in its series CREATES Research Papers with number 2008-26.

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Length: 43
Date of creation: 26 May 2008
Date of revision:
Handle: RePEc:aah:create:2008-26
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