We use cumulative reaction functions to compare long-run market structures in aggregative oligopoly games. We first compile an IO toolkit for aggregative games. We show strong neutrality properties across market structures. The aggregator stays the same, despite changes in the number of firms...

We study a stochastic dynamic game of process innovation in which firms can initiate and terminate R&D efforts and production at different times. We discern the impact of knowledge spillovers on the investments in existing markets, as well as on the likely structure of newly forming markets, for...

We introduce the concept of cooperative substitutes and complements, and use it to throw light on the conditions for a research joint venture to choose equal levels of R&D by all member firms. We show that the second-order conditions for a symmetric optimum take a particularly simple form,...

How does market organization affect quality innovation efforts and social welfare? Three stochastic dynamic market structures considered are monopoly, duopoly, and social planning. Products can be either linearly or nonlinearly substitutable. The introduction of a step function allows richer...

Previous literature has mostly considered R&D and licensing activities separately. In this paper we examine the effect of licensing on R&D and social welfare. We show that the effect of licensing on the incentive for doing R&D is ambiguous and depends on the costs of doing R&D. We also show that...

Previous literature has mostly considered R&D and licensing activities separately. In this paper we examine the effect of licensing on R&D and social welfare.We show that the effect of licensing on the incentive for doing R&D is ambiguous and depends on the costs of doing R&D. We also show that...

In this note we reconsider the paper of Brod and Shivakumar (1999), published in the Journal of Industrial Economics, who analyze a two- stage model in which the firms compete in two dimensions and examine the effect of semi-collusion when the non-production activity is R&D. They shed light on...

In the 1950s and 60s, Japanese and US antitrust authorities occassionally used the degree of concentration to regulate industries. Does regulating firms based on their market shares make theoretical sense? We set up a simple duopoly model with stochastic R&D activities to evaluate market share...

The Riegle-Neal Act in the US and the Economic and Monetary Union in Europe are recent initiatives to stimulate financial integration.These initiatives allow new entrants to "poach" the incumbents' clients by offering them attractive loan offers.We show that these deregulations may be...

We show that competing firms relax overall competition by lowering future barriers to entry.We illustrate our findings in a two-period model with adverse selection where banks strategically commit to disclose borrower information.By doing this, they invite rivals to enter their market.Disclosure...