The Bmw Model: Simple Macroeconomics for Closed and Open Economies - a Requiem for the Is/Lm-As/Ad and the Mundell-Fleming Model

Wuerzburg Economics Working Paper No. 35

77 Pages Posted: 8 Apr 2003

See all articles by Peter Bofinger

Peter Bofinger

University of Würzburg - Institute of Economics and Social Sciences

Eric Mayer

University of Würzburg - Institute of Economics and Social Sciences

Timo Wollmershaeuser

Ifo Institute for Economic Research; CESifo (Center for Economic Studies and Ifo Institute)

Date Written: July 2002

Abstract

While the IS/LM-AS/AD model is still the central tool of macroeconomic teaching in most macroeconomic textbooks, it has been criticised by several economists. Colander [1995] has demonstrated that the framework is logically inconsistent, Romer [2000] has shown that it is unable to deal with a monetary policy that uses the interest rate as its operating target, Walsh [2001] has criticised that it is not well suited for an analysis of inflation targeting. In our paper we start with a short discussion of the main flaws of the IS/LM-AS/AD model. We present the BMW model as an alternative framework, which develops the Romer approach into a very simple, but comprehensive macroeconomic model. In spite of its simplicity it can deal with issues like inflation targeting, monetary policy rules, and central bank credibility. We extend the model to an open-economy version as a powerful alternative to the IS/LM-based Mundell-Fleming (MF) model. The main advantage of the open-economy BMW model is its ability to discuss the role of inflation and the determination of flexible exchange rates while the MF model is based on fixed prices and constant exchange rates.

This working paper is an extended and more theoretical version of Wuerzburg Economic Paper No. 34. Besides describing the derivation of optimal interest rate rules and the concept of loss functions more in detail, it also discusses simple interest rate rules in an open economy as well as a strategy of managed floating within the same theoretical framework. Additionally, we explore the stabilizing properties of simple interest rate rules.

Keywords: monetary policy, inflation targeting, optimal interest rate rules, simple rules, managed floating, IS/LM, Mundell-Fleming

JEL Classification: A2, E1, E5, F41

Suggested Citation

Bofinger, Peter and Mayer, Eric and Wollmershaeuser, Timo, The Bmw Model: Simple Macroeconomics for Closed and Open Economies - a Requiem for the Is/Lm-As/Ad and the Mundell-Fleming Model (July 2002). Wuerzburg Economics Working Paper No. 35, Available at SSRN: https://ssrn.com/abstract=327742 or http://dx.doi.org/10.2139/ssrn.327742

Peter Bofinger (Contact Author)

University of Würzburg - Institute of Economics and Social Sciences ( email )

Sanderring 2
Wuerzburg, 97070
Germany
+49 931 312 944/5 (Phone)
+49 931 312 775 (Fax)

Eric Mayer

University of Würzburg - Institute of Economics and Social Sciences ( email )

Sanderring 2
Wuerzburg, 97070
Germany

Timo Wollmershaeuser

Ifo Institute for Economic Research ( email )

Poschingerstrasse 5
Munich, 81879
Germany
+49 89 9224 1406 (Phone)
+49 89 9224 1462 (Fax)

HOME PAGE: http://www.ifo.de/link/wollmershaeuser_t.htm

CESifo (Center for Economic Studies and Ifo Institute)

Poschinger Str. 5
Munich, DE-81679
Germany

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