We present new indicators of U.S. technological change for the period 1909-49 based on information in the Library of Congress’ catalogue. We use these indicators to estimate the connections between technological change and economic activity, and to investigate the relationship between...

Difficulties in sorting out the empirical relationship between technical change and employment is attributable, at least in part, to the shortcomings associated with traditional measures of the former. In this paper, we use new indicators of technical change that we believe resolve many issues...

Are uncertainty shocks an important source of post WWII business cycle fluctuations? The evidence we present in this paper suggests they are. Using both the traditional measure of uncertainty – the stock market volatility index – and a new one - based on the number of New York Times’...