This study uses data for the U.S. from the May 1991 CPS and for Germany from the 1990 wave of the Socioeconomic Panel (GSOEP) to analyze when people work during the day and week. The evidence shows: 1) Work in the evenings or at night is quite common in both countries, with around 7 percent of...

This paper discusses the impact of a firm's technology portfolio on its market value. Two concepts are used to characterize a firm's portfolio: the number of technological fields and the degree of relatedness within the portfolio characterized by the amount of joint occurrences of patents in...

This paper analyzes research efficiency at the industry level in manufacturing for 13 European member and four nonmember countries during 2000 and 2004. A unique dataset was compiled that matches patent applications at the European Patent Office (EPO) to industry-specific R&D inputs from EU...