Why does inventory investment fluctuate so much during contractions?
Inventory investment appears to have a significant impact on the movement of aggregate output during business cycle contractions. Recent empirical evidence has raised doubts about the often used assumption of a buffer-stock/production-smoothing motivation for inventory. Work by Blinder and Maccini suggests that the use of an (S,s), or intermittent adjustment decision rule, better explains the stylized facts of the dynamics of inventory investment. This has led to the focus on the (S,s) as an alternative to production-smoothing. I assume that some agents use the (S,s) adjustment rule while others attempt to smooth production in the face of convex costs and uncertain demand. I simulate the interaction of heterogeneous agents (representing manufacturing, wholesale and retail agents) with different inventory decision rules to demonstrate that the stylized facts can be explained by a disaggregated model with vertical coupling between agents. The simulations find opposite aggregation bias effects for (S,s) agents than for production smoothing agents. In particular, aggregation horizontally across agents and/or temporally decreased the relative variability of production/ordering to sales for (S,s) agents while it increased the relative variability for production smoothing agents. The simulations also revealed synchronization by (S,s) agents when subjected to aggregate shocks. This may explain in some of the asymmetrical characteristics of the business cycle.
|Date of creation:||1994|
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|Publication status:||Published in Journal of Economic Behavior and Organization, January 1997|
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