Microeconomic Inventory Adjustment and Aggregate Dynamics

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Staff Reports

Microeconomic Inventory Adjustment and Aggregate Dynamics

December 1998 Number 54

JEL classification: D2, E2, E3

Authors: Jonathan McCarthy and Egon Zakrajsek

We examine the microeconomic and aggregate inventory dynamics in the business sector of the U.S. economy. We employ high-frequency firm-level data and use an empirically tractable model, in which the aggregate dynamics are derived explicitly from the underlying microeconomic data. Our results show that the microeconomic adjustment function in both the manufacturing and trade sectors is nonlinear and asymmetric, results consistent with firms using (S,s)-type inventory policies. There are differences in the estimated adjustment functions between the two sectors as well as the durable and nondurable goods firms within each sector. The estimated adjustment function is remarkably stable across subperiods, indicating little change in the inventory adjustment process over time. As predicted by our model, higher moments of the cross-sectional distribution of inventory deviations affect aggregate inventory dynamics.

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