Product variety and market structure: A new measure and a simple test
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- Strickland, Allyn D & Weiss, Leonard W, 1976. "Advertising, Concentration, and Price-Cost Margins," Journal of Political Economy, University of Chicago Press, vol. 84(5), pages 1109-1121, October.
- Coase, R H, 1979. "Payola in Radio and Television Broadcasting," Journal of Law and Economics, University of Chicago Press, vol. 22(2), pages 269-328, October.
- Sutton, C J, 1974. "Advertising, Concentration and Competition," Economic Journal, Royal Economic Society, vol. 84(333), pages 56-69, March.