Sensitivity of Impulse Responses to Small Low-Frequency Comovements: Reconciling the Evidence on the Effects of Technology Shocks

Nikolay Gospodinov, Alex Maynard and Elena Pesavento

Journal of Business & Economic Statistics, 2011, vol. 29, issue 4, 455-467

Abstract: This article clarifies the empirical source of the debate on the effect of technology shocks on hours worked. We find that the contrasting conclusions from levels and differenced vector autoregression specifications, documented in the literature, can be explained by a small low-frequency comovement between hours worked and productivity growth that gives rise to a discontinuity in the solution for the structural coefficients identified by long-run restrictions. Whereas the low-frequency comovement is allowed for in the levels specification, it is implicitly set to 0 in the differenced vector autoregression. Consequently, even when the root of hours is very close to 1 and the low-frequency comovement is quite small, removing it can give rise to biases of sufficient size to account for the empirical difference between the two specifications.

Date: 2011
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Related works:
Journal Article: Sensitivity of Impulse Responses to Small Low-Frequency Comovements: Reconciling the Evidence on the Effects of Technology Shocks (2011)
Working Paper: Sensitivity of Impulse Responses to Small Low Frequency Co-Movements: Reconciling the Evidence on the Effects of Technology Shocks (2009)
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DOI: 10.1198/jbes.2011.10042

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