NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

The IT Revolution and the Stock Market

Jeremy Greenwood, Boyan Jovanovic

NBER Working Paper No. 6931
Issued in February 1999
NBER Program(s):   PR

A new technology or product is often developed by the single entrepreneur. Whether he reaches the public offering stage or is acquired by a listed firm it takes time for the innovator to add value to the stock market. Indeed first, reduce the market's value because some firms -- usually large or old -- will cling to old technologies that have lost their momentum. This paper argue that (a) the market declined in the late 1960s because it felt that the old technologies either had lost their momentum or would give way to IT, and that (b) IT innovators boosted the stock market's value only in the 1980s. If the stock market provides a forecast of future events, then the recent dramatic upswing represents a rosy estimate about growth in future profits for the economy. This translates into a forecast of higher output and productivity growth, holding other things equal (such as capital's share of income).

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Document Object Identifier (DOI): 10.3386/w6931

Published: Published as "The Information-Technology Revolution and the Stock Market", American Economic Review, Vol. 89, no. 2 (May 1999): 116-122.

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