Market concentration ratios are popular statistics for characterizing the extent of market dominance in an imperfectly competitive market, but these ratios may not agree when comparing two markets. Neither do they necessarily agree with the Herfindahl-Hirschman or entropy indices. This letter...

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This paper constructs an equilibrium model of the supply behavior of an industry comprised of utility maximizing owner-operators, and derives its implications for empirical work. Except for the case of long-run constant costs, the perverse results for the firm (a backwar d-bending labor supply...