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Growth through Heterogeneous Innovation, Second Version

Author

Listed:
  • Ufuk Akcigit

    (Department of Economics, University of Chicago)

  • William Kerr

    (Entrepreneurial Management, Harvard Business School)

Abstract

We study how external versus internal innovations promote economic growth through a tractable endogenous growth framework with multiple innovation sizes, multi-product firms, and entry/exit. Firms invest in external R&D to acquire new product lines and in internal R&D to improve their existing product lines. A baseline model derives the theoretical implications of weaker scaling for external R&D versus internal R&D, and the resulting predictions align with observed empirical regularities for innovative firms. Quantifying a generalized model for the recent U.S. economy using matched Census Bureau and patent data, we observe a modest departure for external R&D from perfect scaling frameworks.

Suggested Citation

  • Ufuk Akcigit & William Kerr, 2015. "Growth through Heterogeneous Innovation, Second Version," PIER Working Paper Archive 15-020, Penn Institute for Economic Research, Department of Economics, University of Pennsylvania, revised 25 Mar 2015.
    • Handle: RePEc:pen:papers:15-020
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    More about this item

    Keywords

    Endogenous Growth; Innovation; External; Internal; Research and Development; Patents; Citations; Scientists; Entrepreneurs.;
    All these keywords.

    JEL classification:

    • O31 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Innovation and Invention: Processes and Incentives
    • O33 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Technological Change: Choices and Consequences; Diffusion Processes
    • O41 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - One, Two, and Multisector Growth Models
    • L16 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Industrial Organization and Macroeconomics; Macroeconomic Industrial Structure

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