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What Do We Learn from Blanchard and Quah Decompositions If Aggregate Demand May Not be Long-Run Neutral?

  • John W. Keating

    (Department of Economics, The University of Kansas)

This paper structurally interprets empirical results obtained with Blanchard and Quah (1989) decompositions of output into permanent and transitory shocks. This is done using assumptions about the qualitative responses of variables to structural shocks that are consistent with many different economic theories. Impulse responses of output to a permanent shock typically behave in a particular way before World War I that is unusual compared to post-World War II responses. Also, permanent shocks typically explain a larger share of output variance in that earlier period. We show these two empirical results provide evidence that a positive (negative) aggregate demand shock had a permanent positive (negative) effect on output in the pre-World War I period. Thus further support is obtained for that hypothesis based on different empirical evidence and less restrictive structural assumptions. Another empirical result is that impulse responses from postwar data are typically qualitatively consistent with the effects of structural shocks from a standard textbook macro model. We show that Blanchard and Quah’s statistical model will obtain impulse responses consistent with a textbook model as the parameter measuring aggregate demand’s long-run output effect is varied over a specific range. That analysis provides a range of nonneutralities for which Blanchard and Quah-style decompositions will mistakenly appear to be correct.

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File URL: http://www2.ku.edu/~kuwpaper/2009Papers/201302.pdf
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Paper provided by University of Kansas, Department of Economics in its series WORKING PAPERS SERIES IN THEORETICAL AND APPLIED ECONOMICS with number 201302.

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Length: 31 pages
Date of creation: Jan 2013
Date of revision:
Handle: RePEc:kan:wpaper:201302
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