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Dynamics of Markups, Concentration, and Product Span

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  • Elhanan Helpman
  • Benjamin Niswonger

Abstract

We develop a model with a finite number of multiproduct firms together with a continuum of single-product firms and study the dynamics that arise from product innovation. Consistent with the available evidence, the model predicts rising markups and concentration and a declining labor share. Our dynamics predict the possibility of an inverted-U relationship between labor productivity and product span, for which we provide suggestive evidence. In the optimal allocation, product span and labor productivity are strictly positively related. We also characterize optimal policies for these types of sectors.

Suggested Citation

  • Elhanan Helpman & Benjamin Niswonger, 2022. "Dynamics of Markups, Concentration, and Product Span," American Economic Journal: Macroeconomics, American Economic Association, vol. 14(3), pages 42-81, July.
    • Handle: RePEc:aea:aejmac:v:14:y:2022:i:3:p:42-81
    DOI: 10.1257/mac.20200378
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    More about this item

    JEL classification:

    • D21 - Microeconomics - - Production and Organizations - - - Firm Behavior: Theory
    • D33 - Microeconomics - - Distribution - - - Factor Income Distribution
    • D43 - Microeconomics - - Market Structure, Pricing, and Design - - - Oligopoly and Other Forms of Market Imperfection
    • J24 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Human Capital; Skills; Occupational Choice; Labor Productivity
    • O31 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Innovation and Invention: Processes and Incentives

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