The Mundell-Fleming Model: A dirty float version

A popular model in the teaching of macroeconomics of open economies at the undergraduate level is the Mundell-Fleming (MF). This model assumes that there is free capital mobility and takes into account two extreme exchange rate regimes: fixed and freely floating.

But there is a third regime, currently of relevance to many central banks, which is not addressed in the MF: one in which the central bank sets the short-term interest rate and maintains a dirty-float exchange-rate regime.

In this paper, an MF with these characteristics is presented. It is a simple, practical and user-friendly model that can be used to address contemporary issues, making it suitable for central banks or the teaching of macroeconomics at undergraduate level as a complement –or even a substitute– for the traditional MF.

Keywords

Dirty float, Mundell-Fleming Model, Imperfect capital mobility

JEL Classification

F41, E42, E52, E58