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Patterns of Comovement: The Role of Information Technology in the U.S. Economy

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  • Hyunbae Chun
  • Jung-Wook Kim
  • Jason Lee
  • Randall Morck

Abstract

Firm-specific variation in stock returns and fundamental performance measures is significantly higher in industries that have a history of more investment in information technology (IT). We hypothesise that IT is associated with creative destruction or product differentiation, either of which can widen the performance difference between winner and loser firms. Thus, economy-level volatility can fall while firm-level volatility rises because firm-specific volatility cancels out in the aggregate. Our results are consistent with rising firm-specific variation in US stocks reflecting a rising pace of creative destruction; and with greater firm-specific variation in richer and faster growing countries reflecting more intensive creative destruction in those economies, though other explanations are probably valid as well.

Suggested Citation

  • Hyunbae Chun & Jung-Wook Kim & Jason Lee & Randall Morck, 2004. "Patterns of Comovement: The Role of Information Technology in the U.S. Economy," NBER Working Papers 10937, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:10937
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    2. Arthur M. Diamond, Jr., 2006. "Schumpeter's Creative Destruction: A Review of the Evidence," Journal of Private Enterprise, The Association of Private Enterprise Education, vol. 22(Fall 2006), pages 120-146.
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    5. Diego A. Comin & Thomas Philippon, 2006. "The Rise in Firm-Level Volatility: Causes and Consequences," NBER Chapters, in: NBER Macroeconomics Annual 2005, Volume 20, pages 167-228, National Bureau of Economic Research, Inc.

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    JEL classification:

    • G0 - Financial Economics - - General
    • E3 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles
    • O3 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights
    • O4 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity

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