Approximating Walrasian Equilibria

This paper proposes a price adjustment process that converges globally for a set of pure exchange economies, in which each agent has a Constant Elasticity of Substitution (CES) utility function. In this process, the auctioneer approximates demand schedules by assuming that each trader has a Cobb-Douglas utility function. The process generates prices that cannot be represented by linear combinations of previous prices, and hence precludes cycles. In the so-called unstable Scarf economies, prices spiral towards the Walrasian equilibrium in the same direction as found by Scarf. Simulation in large scale Scarf economies
suggests that the speed of convergence may be polynomial in the size of the economy.