The Information-Technology Revolution and the Stock Market

Technological progress comes in waves. The British Industrial Revolution ( 1760 – 1850) ushered in Cort’s puddling and rolling process for making iron, Crompton’s mule for spinning cotton, and the Watt steam engine. The Second Industrial Revolution ( 1890 – 1930) witnessed the rise of electricity, the internal-combustion engine, and the chemical industry. The birth of information technology (IT) may herald the start of a Third Industrial Revolution. A new technology or product is often developed by the single entrepreneur who initially finds it hard to get funds, develop the product, and find customers. But if the product is good, customers eventually line up, and investors flock in. Other firms then move in to make the product and may drive the innovator out or acquire him. Whether he reaches the initial public offering (IPO) stage or is acquired by a listed firm, though, it takes time for the innovator to add value to the stock market. Indeed, the innovation may, at first, reduce the market’s value because some firms, usually large or old, will cling to old technologies that have lost their momentum. Figure 1 plots the market value of U.S. equity relative to GDP. This paper argues that (a) the market declined in the late 1960’s 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 1980’s. 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