L'exposé présente un certain nombre d'éléments expliquant pourquoi les activités se développant sur le Net ne peuvent pas être bien appréhendées dans un contexte de concurrence parfaite, et discute la nature des barrières à l'entrée. Nous verrons que l'essentiel des changements...

We develop and estimate a model of dynamic interactions between households where commitment is limited and contracts are incomplete to explain the patterns of income and consumption growth in village economies of less developed countries. Households can insure through both formal contracts and...

The World Wide Web was originally a totally English-based medium due to its US origin. Although the presence of other languages has steadily risen, content in English is still dominant, which raises a natural question of how bilingualism of consumers of a home country affects production of web...

We consider a network that intermediates traffic between free content providers and consumers. While consumers do not know the traffic cost when deciding on consumption, a content provider knows his cost but may not control the consumption. We study how pricing consumers' and content providers'...

The paper discusses economic theories of harm for anti-competitive margin squeeze by unregulated and regulated vertically integrated firms. We review both predation and foreclosure theories, as well as the mere exploitation of upstream market power. We show that foreclosure provides an...

Platforms use search diversion in order to trade off total consumer traffic for higher revenues derived by exposing consumers to products other than the ones that best fit their preferences. Our analysis yields three key and novel insights regarding search diversion incentives, which have direct...

This paper presents a model of media competition with free entry when media platforms are financed both from advertising receipts and customers' subscriptions. We establish a relationship between the equilibrium levels of prices, advertising and entry, the welfare maximizing levels and the...

This Paper examines competition between a dominant network and a challenging network with third-degree or perfect price-discrimination, allowing for arbitrary configurations of network externalities, as well as horizontal and vertical product differentiation. Domination in the coordination game...