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Technological Change and the Stock Market

  • John Laitner
  • Dmitriy Stolyarov

Tobin's average q has usually been well above 1, but fell below 1 during 1974-1984. Our model explains this pattern and reconciles it with unchanging aggregate investment. The stock market value in the numerator of q reflects ownership of physical capital and knowledge, but the denominator measures just physical capital. Therefore, q is usually above 1. Periodic arrivals of important new technologies, such as the microprocessor in the 1970's, suddenly render old knowledge and capital obsolete, causing the stock market to drop. National accounts measures of physical capital miss this rapid obsolescence. Then q appears to drop below 1. (JEL E44, O3, O41)

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File URL: http://www.aeaweb.org/articles.php?doi=10.1257/000282803769206287
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Article provided by American Economic Association in its journal American Economic Review.

Volume (Year): 93 (2003)
Issue (Month): 4 (September)
Pages: 1240-1267

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Handle: RePEc:aea:aecrev:v:93:y:2003:i:4:p:1240-1267
Note: DOI: 10.1257/000282803769206287
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