Contribution to a book:

Helmuth Cremer, André Grimaud and Marc de Rycke, "Alternative Scenarios for the Reform of Postal Services: Optimal Pricing and Welfare", in Commercialization of Postal and Delivery Services: National and International Perspectives, Michael A. Crew and Paul R. Kleindorfer (eds.), series Topics in Regulatory Economics and Policy, vol. 19, chapter 17, 1994.