Structural Stability in Models of American Trade Union Growth

Neil Sheflin, Leo Troy and C. Timothy Koeller

The Quarterly Journal of Economics, 1981, vol. 96, issue 1, 77-88

Abstract: Recent interest in trade union activity has led to the development of econometric models of union membership growth. This paper examines the structural stability of two of the leading models—Ashenfelter-Pencavel's and Bain-Elsheikh's—each of which claimed to have captured the primary determinants of union growth in the twentieth century. The models were reestimated using revised, corrected, and extended membership data, and a nonlinear, maximum-likelihood procedure was employed to estimate the shift-point for each model. Contrary to previous studies, we found evidence of a break in the structure of each model. And unlike earlier work that hypothesized a World War II break-point, our estimated point was 1937–1938, most likely reflecting the impact of the Wagner Act.

Date: 1981
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