Greif, Milgrom and Weingast (1994) argued that the ability of the merchant guilds to encourage trade expansion required an internal mechanism to enforce compliance to trade embargoes, otherwise credible incentives for "embargo breaking" would have rendered them ine¤ectual. We show that...

The jury is still out on the need for government-organized capacity markets in order to achieve efficient long-run investments in electricity generation. When new capacity markets are introduced, however, it is important that they are well designed and take account of existing experience and...

We revisit Greif's (1993) analysis of trade between the 11th-century Maghribi traders and present two different models which bring into play, in an essential way, historical features of the Maghribi's organization which had no role in Greif's own analysis. Our reformulation of the Maghribi's...

This paper presents results from a calibrated welfare model of the UK mobile telephony market which includes many mobile networks; calls to and from the fixed network; networkbased price discrimination; and call externalities. The analysis focuses on the short-run effects of adopting lower...

The conventional wisdom that mobile operators are able to act as monopolists in pricing call termination on their networks has recently been challenged by Hutchison 3G’s entry into European mobile markets. The European Commission’s electronic communications regime allows national regulatory...

This paper surveys the recent literature on competition between mobile network operators in the presence of call externalities and network effects. It shows that the regulation of mobile termination rates based on “long-run incremental costs” increases networks’ strategic incentives to...