We propose a general model of monopolistic competition which encompasses existing models while being flexible enough to take into account new demand and competition features. Even though preferences need not be additive and/or homothetic, the market outcome is still driven by the sole variable...

We show the effects of product differentiation and product market competition on technology licensing by an outside innovator. For a certain range of product differentiation, both the innovator and the society prefer royalty licensing compared to auction (or fixed-fee), irrespective of Cournot...

It is generally believed that a weak patent protection makes the consumers and the society better off compared to a strong patent protection by increasing the intensity of competition if the weak patent protection does not affect innovation. We show that this conclusion may not hold if the...

Many industries are made of a few big firms, which are able to manipulate the market outcome, and of a host of small businesses, each of which has a negligible impact on the market. We provide a general equilibrium framework that encapsulates both market structures. Due to the higher toughness...

We provide a selective survey of what has been accomplished under the heading of monopolistic competition in industrial organization and other economic fields. Among other things, we argue that monopolistic competition is a market structure in its own right, which encompasses a much broader...

We study how the supply of environmentalism, which is defined by psychic benefits (costs) associated with the purchase of high-environmental (low-environmental) qualities, affects the way firms choose their products and the ensuing consequences for the global level of pollution. Contrary to...