NONROBUSTNESS OF DYNAMIC DUAL MODELS OF THE U.S. DAIRY INDUSTRY

Wayne H. Howard and C. Shumway

Northeastern Journal of Agricultural and Resource Economics, 1989, vol. 18, issue 01, 8

Abstract: The robustness of dynamic dual model results across functional forms is examined for the U.S. dairy industry. Modified generalized Leontief (GL) and normalized quadratic (NQ) functional forms are compared by examining their consistency with properties of the competitive firm, estimated rates of adjustment for cows and labor, tests of technological change, and elasticities. Homogeneity and symmetry are maintained in both models. Convexity is not rejected by the GL and is not seriously violated by the NQ. Absence of technological change is rejected by both models, but quality indexes on labor and cows fully embody technological change occurring within labor and cows in the NQ but not in the GL. Policy-relevant elasticities differ greatly between the functional forms. Dynamic dual models are found to be non-robust in important ways to choice of function form.

Keywords: Livestock; Production/Industries (search for similar items in EconPapers)
Date: 1989
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Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:ags:nejare:28808

DOI: 10.22004/ag.econ.28808

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