During the 1980s and into this decade, U.S. businesses poured billions of dollars into computers and other information technology. Yet the productivity performance of the U.S. economy in the 1980s remained lackluster--especially in the service sector--leading many observers to suspect that companies were not getting their money's worth from these high-tech investments. At the same time, academic research found little evidence of a productivity payoff. But have the tables now turned? With an apparent improvement in productivity in recent years, much academic and popular opinion now suggests...