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Optimal Choice of Product Scope for Multiproduct Firms under Monopolistic Competition

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Author Info
Robert Feenstra
Hong Ma

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Abstract

In this paper we develop a monopolistic competition model where firms exercise their market power across multiple products. Even with CES preferences, markups are endogenous. Firms choose their optimal product scope by balancing the net profits from a new variety against the costs of "cannibalizing" their own sales. With identical costs across firms, opening trade leads to fewer firms surviving in each country but more varieties produced by each of those firms. With heterogeneous costs, the number of firms surviving in equilibrium is quite insensitive to the market size. When trade is opened, more firms initially enter, but the larger market size reduces the cannibalization effect and expands the optimal scope of products. As a result, the less efficient firms exit, and the larger market is accommodated by more efficient firms that produce more varieties per firm on average.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 13703.

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Date of creation: Dec 2007
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Handle: RePEc:nbr:nberwo:13703

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Find related papers by JEL classification:
F12 - International Economics - - Trade - - - Models of Trade with Imperfect Competition and Scale Economies
L1 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance

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This page was last updated on 2009-11-10.

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