This paper analyzes the terrorist threat following 9/11, and explores its implications for defense R&D. First, it reviews the composition of defense R&D since 9/11: big weapon systems still command 30% of defense R&D spending (legacy of the Cold War), vis-a-vis just about 13% for intelligence...

This paper asks the question: Can we see evidence of General Purpose Technologies in patent data? Using data on three million US patents granted between 1967 and 1999, and their citations received between 1975 and 2002, we construct a number of measures of GPTs, including generality, number of...

This outstanding collection provides a fitting tribute to the diversity and depth of Paul David’s contributions. The papers included range from simulation models of the evolution of market structure in the presence of innovation, through historical investigations of knowledge networks and...

This empirical analysis focuses on the impact of the economic cycle on firms' ability to sustain cooperative behavior within an explicit cartel agreement that existed during the interwar period in the Northern French coalfields. The basic model is based on Bresnahan (1982) and adapted to the...

This book focuses on technological policies, in other words all public interventions intended to influence the intensity, composition and direction of technological innovations within a given entity (region, country or group of countries). The editor has gathered together many of the leading...

This book focuses on technological policies, in other words all public interventions intended to influence the intensity, composition and direction of technological innovations within a given entity (region, country or group of countries). The editor has gathered together many of the leading...

The main goal of this paper is to develop an empirical framework for evaluating the patient welfare benefits arising from pharmaceutical innovation. Extending previous studies of the welfare benefits from innovation (Trajtenberg, 1990; Hausman, 1996), this paper unpacks the separate choices made by...