Introduction

The taking into account of expectations remains an important subject in macroeconomic model building. This monograph presents the most recent results concerning the formulation of models including rational expectations. In clarifying the technical aspects of these results, we hope to allow the reader — who is not necessarily familiar with the econometric literature treating models with rational expectations — to measure the impact of the rationality hypothesis formulated by Muth in 1961 and its repercussions, especially in terms of macroeconomic models.