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Substitutability, Cost Effectiveness, and Output (revised 23 April 2012; formerly titled “Product Change and Output Invariance” and then “Output Invariance Across Products”)

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    Abstract

    This note gives a method that can sometimes be used to find the long-run equilibrium output of a firm operating under imperfect competition and which differs from standard methods of output determination. Let X be a product supplied under oligopoly or monopolistic competition and suppose that, by changing certain properties of X, we arrive at a new product, Y, which is sold under perfect competition. For example, Y might be a generic version of a good or service, while X is a differentiated version. Under a basic assumption given in the paper, this firm’s equilibrium output of X will then be where the average cost of Y reaches its minimum. At the level of the firm, the equilibrium outputs of the two goods will be the same, in other words, as long as each product is viable. While this outcome is not consistent with a first-best welfare maximum, it does have a desirable welfare property.

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    Bibliographic Info

    Paper provided by Carleton University, Department of Economics in its series Carleton Economic Papers with number 04-18.

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    Length: 18 pages
    Date of creation: 29 Nov 2004
    Date of revision: 09 Oct 2012
    Publication status: Published: Carleton Economic Papers
    Handle: RePEc:car:carecp:04-18

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    Keywords: Output Invariance; imperfect competition; second best.;

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    1. N. Gregory Mankiw & Michael D. Whinston, 1986. "Free Entry and Social Inefficiency," RAND Journal of Economics, The RAND Corporation, vol. 17(1), pages 48-58, Spring.
    2. Rosen, Sherwin, 1974. "Hedonic Prices and Implicit Markets: Product Differentiation in Pure Competition," Journal of Political Economy, University of Chicago Press, University of Chicago Press, vol. 82(1), pages 34-55, Jan.-Feb..
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