A Review of Nonfundamentalness and Identification in Structural VAR Models

Lucia Alessi, Matteo Barigozzi and Marco Capasso

LEM Papers Series from Laboratory of Economics and Management (LEM), Sant'Anna School of Advanced Studies, Pisa, Italy

Abstract: We review, under a historical perspective, the developement of the problem of non- fundamentalness of Moving Average (MA) representations of economic models, starting from the work by Hansen and Sargent [1980]. Nonfundamentalness typically arises when agents' information space is larger than the econometrican's one. Therefore it is impos- sible for the latter to use standard econometric techniques, as Vector AutoRegression (VAR), to estimate economic models. We re-state the conditions under which it is pos- sible to invert an MA representation in order to get an ordinary VAR, and we consider how the latter is used in the literature to assess the validity of Dynamic Stochastic Gen- eral Equilibrium models, providing some interesting examples. We believe that possible nonfundamental representations of considered models are too often neglected in the liter- ature. We consider how factor models can be seen as an alternative to VAR for assessing the validity of an economic model without having to deal with the problem of nonfun- damentalness. We then review the works by Lippi and Reichlin [1993] and Lippi and Reichlin [1994] which are the first attempts to give to nonfundamental representations the economic relevance that they deserve, and to outline a method to obtain such repre- sentations starting from an estimated VAR.

Keywords: Nonfundamentalness; Structural VAR; Dynamic Stochastic General Equilibrium Models; Factor Models (search for similar items in EconPapers)
Date: 2007-10-01
New Economics Papers: this item is included in nep-ecm and nep-ets
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Citations: View citations in EconPapers (10)

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Working Paper: A review of nonfundamentalness and identification in structural VAR models (2008)
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Persistent link: https://EconPapers.repec.org/RePEc:ssa:lemwps:2007/22

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