While ordinal complementarity is more general than cardinal complementarity, the corresponding global sufficient conditions placed on the primitives of a constrained optimization problem are generally not comparable. We explore this issue in detail for the special case of a Cournot firm. We...

We consider a finite number of firms which compete imperfectly for heterogenous workers. Firms produce a homogeneous good sold on a competitive market and face demand-induced price fluc- tuations. It is then shown that unemployment may arise in equilibrium because of uncertainty on product...

In this paper we develop a model of a vertically differentiated industry where the production of higher quality goods needs a higher fraction of specialized labour. In the first stage, firms choose the quality of their products, in the second, both good prices and skilled workers’ wages are...

This paper examines a three-stage model of divisionalization where, first, two parent firms create independent units, second, the parent firms allocate cost reduction levels over these units, and third, the resulting units compete in a Cournotmarket given their current costs of production. The...

We discuss the welfare effects of bundling two products offered by two symmetric firms. We first show that, in terms of welfare, a monopoly does better than a duopoly in which each firm sell its good and that a monopoly selling the bundle does better than if it sells the bundle and the two goods...

What is the effect of product market integration on the market equilibrium in the presence of international network externalities in consumption? To address this question, we set up a spatial two-country model and we find that the economic forces at work may have an ambiguous effect on prices.

We analyse firms' incentives to provide two-way compatibility between two network goods with different intrinsic qualities. We study how the relative importance of vertical differentiation with respect to the network effect influences the price competition as well as the compatibility choice....

The paper studies equilibria for economies with imperfect competition and non-convex technologies. Following Negishi, firms maximise profits under downward-sloping perceived demand functions. Negishi's assumptions, in particular the assumption of a single monopolistic competitor in each market,...

Two types of agents interact on a pre-existing free platform. Agents value positively the presence of agents of the other type but may value negatively the presence of agents of their own type. We ask whether a new platform can find fees and subsidies so as to divert agents from the existing...

It is shown that optimal penal codes are security level penal codes in a general class of stochastic dynamic Bertrand games with capacity constraints. This result allows a more complete study of the behavior of collusion over the business cycle. In an illustrative linear duopoly example with...