Markets for technology can promote innovation by allowing for division of labor in research and development. Some firms may specialize in the discovery of ideas, while others have a comparative advantage in later stages of development and marketing. However, these gains depend on the timing of...

This paper quantifies the relationship between market size and innovation in the pharmaceutical industry. We estimate the elasticity of innovation, as measured by the number of new chemical entities appearing on the market for a given disease class, to the potential market size represented by...

This paper studies how patent rights and price regulation affect how fast new drugs are launched in different countries, using newly constructed data on launches of 642 new drugs in 76 countries for the period 1983-2002, and information on the duration and content of patent and price control...

This Paper empirically tests the ‘bounds approach’ to industry structure proposed by Sutton ((1991), (1998)). To carry out this task, we focus on the chemical industry. Part of the novelty in this exercise is that we work on the finest possible level of disaggregation. Also, we identify...

A firm that introduces a new good enjoys monopoly profits for some initial period of time. What happens subsequently depends upon the relative strength of knowledge diffusion and increasing dominance. The first effect enhances challengers’ ability to develop the product, erodes the...

Using new data on citations to university patents and scientific publications, and measures of distance based on Google maps, we study how geography affects university knowledge diffusion. We show that knowledge flows from patents are localized in two respects: they decline sharply with distance...

Cumulative innovation is central to economic growth. Do patent rights facilitate or impede such follow-on innovation? This paper studies the effect of removing patent protection through court invalidation on the subsequent research related to the focal patent, as measured by later citations. We...

We introduce two simple new variants of the Jackknife Instrumental Variables (JIVE) estimator for overidentified linear models and show that they are superior to the existing JIVE estimator, significantly improving on its small sample bias properties. We also compare our new estimators to...

We study the problem of an inventor who brings to the market an innovation that can be legally copied. Imitators may 'enter' the market by copying the innovation at a cost or by buying from the inventor the knowledge necessary to reproduce and use the invention. The possibility of contracting...

We study how fragmentation of patent rights ('patent thickets') and the formation of the Court of Appeal for the Federal Circuit (CAFC) affected the duration of patent disputes, and thus the speed of technology diffusion through licensing. We develop a model of patent litigation which predicts...