This paper reports a search for general tendencies among models that look at spillovers in
innovative activities. A number of inferences are detailed that appeared in a wide class of …

This paper reexamines the issue of optimal patent breadth in extending the earlier literature
to the case where many firms race for a patent. It also discusses several examples that …

A contest is a situation in which players compete with one another by expending effort to win
a prize. Examples abound. Firms compete by spending R&D expenditures to win a patent …

To address the relationship between innovation and competition we jointly estimate the
opportunity, production, and impact functions of innovation in a simultaneous system. Based …

Introduction Is product market competition conducive to innovation and growth, or does it
dampen incentives for research and development (R&D)? This is one of the longest …

In this paper we compare the equilibrium R & D investment under Bertrand and Cournot
competition in a symmetric and homogeneous oligopoly. It is shown that, although the R&D …

We examine players' equilibrium effort levels in a contest with difference-form contest
success functions in which two players compete with each other to win a prize. We show the …

Without spillovers and under the 'winner-take-all'hypothesis, there is overinvestment in R &
D in a non-cooperative equilibrium due to duplication of effort. We show that a public firm …

We consider contests with two players in which each player has the option of hiring a
delegate who expends her effort to win a prize on his behalf. We first show when no …

In this paper some reflections are developed on the relation between the organization of
markets and innovative activities. The IO (Industrial Organization) predictions often depend …