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Literatur zur Politischen Ökonomie
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Zacharias (2001): Testing Profit Rate Equalization
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Testing Profit Rate Equalization in the U.S. Manufacturing Sector: 1947–1998
Long-run differentials in interindustrial profitability are relevant for several areas of theoretical and applied economics because they characterize the overall nature of competition in a capitalist economy. This paper argues that the existingempirical models of competition in the industrial organization literature suffer from serious flaws.

An alternative framework, based on recent advances in the econometric modeling of the long run, is developed for estimating the size of long-run profit rate differentials. It is shown that this framework generates separate, industry-specificestimates of two potential components of long-run profit rate differentials identified in economic theory.

One component, the noncompetitive differential, stem from factors that do not depend directly on the state of competition; these factors are generally characterized as risk and other premia. The other component, the competitive differential, is dueto factors that directly depend on the state of competition (factors such as degree of concentration and economies of scale).

Estimates provided here show that during the period under study, the group of industries with statistically insignificant competitive differentials accounted for 72 percent of manufacturing profits and 75 percent of manufacturing capital stock, whichis interpreted as lending support to the theories of competition advanced by the classical economists and their modern followers.

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