This paper empirically tests two industrial-organization models with a sample of 182 U.S. industries, from 1963 to 1967. The models extend standard models and integrate them with dynamics associated with the "persistence of profits” methodologies. We extend it by replacing the traditional cross-section profit equation with a profit-adjustment equation for U.S. industrial data. Out study measures the speed of adjustment of profits and explicitly models steady-state profits, in addition to the speed of structural adjustment and steady-state market structure. We find that the structural-adjustment speed is slower than the profit-adjustment speed and that nonzero economic profits tend to be quite persistent.
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