Short Run Labor Productivity in a Dynamic Model (Classic Reprint)

Understand how firms manage labor and capital in the short run to meet changing demand.

This study analyzes why short-run labor productivity tends to rise with output even when the production function shows diminishing returns. It combines a rigorous dynamic cost-minimization framework with empirical tests using U.S. manufacturing data from 1952–1971. The author emphasizes labor hoarding and the role of quasi-fixed inputs to explain why aggregate labor appears procyclical in the short run.

The book presents two related models that link output, input use, and costs. It shows how a firm with some fixed inputs can adjust over time by moving between external purchases and internal production, capturing gradual capital stock changes and internal costs of adjustment. Through these models, the author demonstrates that short-run elasticity of labor with respect to output can be less than one, while long-run elasticity moves toward unity. The discussion draws on Solow’s labor-hoarding ideas and explores how different types of labor (production vs. nonproduction) contribute to the observed patterns.

• Elasticities: how output changes drive demand for different inputs in the short and long run.
• Quasi-fixed inputs: how increasing costs of adjusting fixed factors affect firm decisions.
• Model comparison: the KLEM and KUSEM frameworks and what they reveal about labor demand and productivity.
• Empirical results: interpretation of 1952–1971 U.S. manufacturing data and implications for SRIRL.

Ideal for readers of econometrics, production theory, and energy- and cost-focused economics who want a clear, model-based view of how firms adapt to cyclical demand without overstating outcomes.