The basic neoclassical growth model accounts well for the postwar cyclical behavior of the U.S. economy prior to the 1990s, provided that variations in population growth, depreciation rates, total factor productivity, and taxes are incorporated. For the 1990s, the model predicts a depressed...

The winner-takes-all business model followed by many U.S. Internet firms predicts that spending on intangibles will exhibit increasing profitability returns-to-scale. That is, larger expenditures should be more profitable per dollar of investment than small expenditures because larger...

Published macroeconomic data traditionally exclude most intangible investment from measured GDP. This situation is beginning to change, but our estimates suggest that as much as $800 billion is still excluded from U.S. published data (as of 2003), and that this leads to the exclusion of more...