Ensuring the Validity of the Micro Foundation in DSGE Models

CREATES Research Papers from Department of Economics and Business Economics, Aarhus University

Abstract: 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.

Keywords: Deterministic trends; DSGE models; Error distributions; Moment generating functions; Stochastic trends; Stochastic volatility; Unit-roots (search for similar items in EconPapers)
JEL-codes: E10 E30 (search for similar items in EconPapers)
Pages: 43
Date: 2008-05-26
New Economics Papers: this item is included in nep-cba, nep-dge, nep-ecm, nep-ets and nep-mac
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