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Federal Reserve Bank of Richmond
Working Paper
Sales, inventories, and real interest rates : a century of stylized facts
Luca Benati
Thomas A. Lubik

We use Bayesian time-varying parameters structural VARs with stochastic volatility to investigate changes in both the reduced-form and the structural correlations between business inventories and either sales growth or the real interest rate in the United States during both the interwar and the post-WWII periods. We identify four structural shocks by combining a single long-run restriction to identify a permanent output shock as in Blanchard and Quah (1989), with three sign restrictions to identify demand- and supply-side transitory shocks. We produce several new stylized facts which should inform the development of new models of inventories. In particular, we show that (i) during both the interwar and the post-WWII periods, the structural correlation between inventories and the real interest rate conditional on identified interest rate shocks is systematically positive; (ii) the reduced-form correlation between the two series is positive during the post-WWII period, but in line with the predictions of theory it is robustly negative during the interwar era; and (iii) during the interwar era, the correlations between inventories and either of the two other series exhibits a remarkably strong co-movement with output at the business-cycle frequencies.

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Luca Benati & Thomas A. Lubik, Sales, inventories, and real interest rates : a century of stylized facts, Federal Reserve Bank of Richmond, Working Paper 12-02, 2012.
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Keywords: Business cycles ; Monetary policy
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