The Cagan monetary model of hyperinflation has a relatively simple structure and a rich set of solutions. However, the wealth of possible solutions of this model does not constitute an asset for it. The introduction of rational expectations into the model was often at the origin of these...

This article highlights the strict association met in the literature between the adaptive expectations assumption and the correct running of the monetary model of hyperinflation. A complete resolution of the model is carried out under the adaptive expectations hypothesis. It is shown that the...