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...