Rational expectations and the role of monetary policy: A generalization

Abstract

This paper investigates the effects of introducing the following two alterations into a multimarket, partial information, rational expectations model; (1) individuals in any market may sample currently more prices than just the current price on their own market; (2) they choose the amount of their current information so as to minimize the sum of the costs of getting information and of being off their full information demand and supply curves. Under those circumstances any change in the variance of aggregate excess demand shocks (whether caused by real or monetary elements) affects the equilibrium level of information in the economy, in addition to its other direct effects previously recognized in the literature. Among the issues dealt with are the implications of these alterations for the following: (1) the Lucas hypothesis on the slope of the Phillips curve; (2) the optimal monetary variance and the optimal money feedback rule; (3) the effect of the level of information and of aggregate variance on the distribution of relative prices and related issues.