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Monopolistic competition and optimum product diversity under firm heterogeneity

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  • Morrow, John
  • Dhingra, Swati

Abstract

Empirical work has drawn attention to the high degree of productivity differences within industries and their role in resource allocation. This paper examines the allocational efficiency of such markets. Productivity differences introduce two new margins of potential inefficiency: selection of the right distribution of firms and allocation of the right quantities across firms. We show that these considerations affect welfare and policy analysis, and market power across firms leads to distortions in resource allocation. Demand-side elasticities determine how resources are misallocated and when increased competition from market expansion provides welfare gains.

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  • Morrow, John & Dhingra, Swati, 2019. "Monopolistic competition and optimum product diversity under firm heterogeneity," LSE Research Online Documents on Economics 59226, London School of Economics and Political Science, LSE Library.
  • Handle: RePEc:ehl:lserod:59226
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    5. Alessia Campolmi & Harald Fadinger & Chiara Forlati, 2018. "Trade and Domestic Policies in Models with Monopolistic Competition," CRC TR 224 Discussion Paper Series crctr224_2018_049, University of Bonn and University of Mannheim, Germany.
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    12. Nocco, Antonella & Ottaviano, Gianmarco I.P. & Salto, Matteo, 2019. "Geography, competition, and optimal multilateral trade policy," Journal of International Economics, Elsevier, vol. 120(C), pages 145-161.
    13. Sergey G. Kokovin & Shamil Sharapudinov & Alexander Tarasov & Philip Ushchev, 2020. "A Theory of Monopolistic Competition with Horizontally Heterogeneous Consumers," CESifo Working Paper Series 8082, CESifo.
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    15. Edwin L.-C. Lai & Haichao Fan & Han Steffan Qi, 2020. "Global gains from reduction in trade costs," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 70(1), pages 313-345, July.
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    17. Atsushi Tadokoro, 2020. "Tariff policies, variable markups, and within-sector missallocation," Discussion Papers in Economics and Business 20-16, Osaka University, Graduate School of Economics.
    18. A. Shapoval & V. M. Goncharenko, 2020. "Industry equilibrium and welfare in monopolistic competition under uncertainty," Journal of Economics, Springer, vol. 130(2), pages 187-218, July.
    19. Mr�zov�, Monika & Neary, J Peter & Parenti, Mathieu, 2017. "Sales and Markup Dispersion: Theory and Empirics," CEPR Discussion Papers 12044, C.E.P.R. Discussion Papers.
    20. Simon P. Anderson & Nisvan Erkal & Daniel Piccinin, 2020. "Aggregative games and oligopoly theory: short‐run and long‐run analysis," RAND Journal of Economics, RAND Corporation, vol. 51(2), pages 470-495, June.
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    22. Atsushi Tadokoro, 2021. "Efficient policy with firm heterogeneity and variable markups," Discussion Papers in Economics and Business 20-17, Osaka University, Graduate School of Economics.

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    Keywords

    efficiency; productivity; social welfare; demand elasticity; markups;
    All these keywords.

    JEL classification:

    • J1 - Labor and Demographic Economics - - Demographic Economics

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