"Estache, Laffont, and Zhang develop a model to analyze the effects of asymmetric information on optimal universal service policy in the public utilities of developing countries. Optimal universal service policy is implemented using two regulatory instruments pricing and network investment. Under discriminatory pricing, asymmetric information leads to a higher price and smaller network in the rural area than under full information. Under uniform pricing, the price is lower but the network is even smaller. In addition, under both pricing regimes, not only the firm but also taxpayers have incentives to collude with the regulator. This paper a product of the Office of the Vice President, Infrastructure Network is part of a larger effort in the network to promote analytical work on emerging policy issues in infrastructure service delivery"--World Bank web site.