Many recent papers have tried to identify behavioral disturbances in vector autoregressions (VAR's) by imposing restrictions on the long-run effects of shocks. This paper argues that this approach will support reliable structured inferences only if the underlying economy satisfies strong restrictions. Absent restrictions linking long-run and short-run dynamics, every decomposition of a VAR is essentially equally consistent with any long-run restriction. Further, dynamic common factor restrictions must hold if the scheme is to work properly in small models estimated using time-aggregated data. The paper illustrates possible consequences of failure of these assumptions using bivariate models to identify aggregate supply and demand disturbances.
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References listed on IDEAS Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
Ahmed, S. & Ickes, B. & Wang, P. & Yoo, S., 1989.
"International Business Cycles,"
Papers
7-89-4, Pennsylvania State - Department of Economics.
Other versions:
Ahmed, Shaghil & Ickes, Barry W. & Ping Wang & Byung Sam Yoo, 1993.
"International Business Cycles,"
American Economic Review,
American Economic Association, vol. 83(3), pages 335-59, June.
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