A public good is produced by a firm using a private good owned by potential consumers. The firm's technology and the consumers' preferences are unobservable to the Central Planning Board (CPB). The CPB's objective is to design a planning procedure that (a) converges to a Pareto-efficient and individually rational allocation and (b) taxes each consumer in proportion to his/her true marginal benefits and re-distributes the dividend generated in proportion to the taxes he/she pays. We refer to such a division of the tax burden and the dividend as the proportional division rule. Given the simultaneous requirements of (a) and (b), there is a crucial incentive problem to be resolved. We show the existence of a planning procedure that retains the convergence properties and implements the proportional rule in myopic Nash equilibrium. © 1991.