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The BMW model: simple macroeconomics for closed and open economies a requiem for the IS/LM-AS/AD and the Mundell-Fleming model

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  • Bofinger, Peter
  • Mayer, Eric
  • Wollmershäuser, Timo

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 Würzburg 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.

Suggested Citation

  • Bofinger, Peter & Mayer, Eric & Wollmershäuser, Timo, 2002. "The BMW model: simple macroeconomics for closed and open economies a requiem for the IS/LM-AS/AD and the Mundell-Fleming model," W.E.P. - Würzburg Economic Papers 35, University of Würzburg, Chair for Monetary Policy and International Economics.
  • Handle: RePEc:zbw:wuewep:35
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    References listed on IDEAS

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    1. Flood, Robert P. & Rose, Andrew K., 1995. "Fixing exchange rates A virtual quest for fundamentals," Journal of Monetary Economics, Elsevier, vol. 36(1), pages 3-37, August.
    2. Guillermo A. Calvo & Carmen M. Reinhart, 2002. "Fear of Floating," The Quarterly Journal of Economics, Oxford University Press, vol. 117(2), pages 379-408.
    3. Svensson, Lars E. O., 2002. "Inflation targeting: Should it be modeled as an instrument rule or a targeting rule?," European Economic Review, Elsevier, vol. 46(4-5), pages 771-780, May.
    4. Baxter, Marianne & Stockman, Alan C., 1989. "Business cycles and the exchange-rate regime : Some international evidence," Journal of Monetary Economics, Elsevier, vol. 23(3), pages 377-400, May.
    5. Hausmann, Ricardo & Panizza, Ugo & Stein, Ernesto, 2001. "Why do countries float the way they float?," Journal of Development Economics, Elsevier, vol. 66(2), pages 387-414, December.
    6. Carmen M. Reinhart, 2000. "Mirage of Floating Exchange Rates," American Economic Review, American Economic Association, vol. 90(2), pages 65-70, May.
    7. Meese, Richard A. & Rogoff, Kenneth, 1983. "Empirical exchange rate models of the seventies : Do they fit out of sample?," Journal of International Economics, Elsevier, vol. 14(1-2), pages 3-24, February.
    8. repec:qba:annpro:v:10:y:2000:id:350 is not listed on IDEAS
    9. Mccallum, Bennet T., 1988. "Robustness properties of a rule for monetary policy," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 29(1), pages 173-203, January.
    10. Bofinger, Peter & Mayer, Eric & Wollmershäuser, Timo & Hülsewig, Oliver, 2003. "The BMW model: A new framework for teaching monetary macroeconomics in closed and open economies," W.E.P. - Würzburg Economic Papers 34, University of Würzburg, Chair for Monetary Policy and International Economics.
    11. Stanley Fischer, 2001. "Exchange Rate Regimes: Is the Bipolar View Correct?," Journal of Economic Perspectives, American Economic Association, vol. 15(2), pages 3-24, Spring.
    12. David H. Romer, 2000. "Keynesian Macroeconomics without the LM Curve," Journal of Economic Perspectives, American Economic Association, vol. 14(2), pages 149-169, Spring.
    13. David Colander, 1995. "The Stories We Tell: A Reconsideration of AS/AD Analysis," Journal of Economic Perspectives, American Economic Association, vol. 9(3), pages 169-188, Summer.
    14. Taylor, John B., 1993. "Discretion versus policy rules in practice," Carnegie-Rochester Conference Series on Public Policy, Elsevier, vol. 39(1), pages 195-214, December.
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    Cited by:

    1. Peter Bofinger & Eric Mayer, 2007. "Monetary and Fiscal Policy Interaction in the Euro Area with Different Assumptions on the Phillips Curve," Open Economies Review, Springer, vol. 18(3), pages 291-305, July.
    2. Bofinger, Peter & Mayer, Eric & Wollmershäuser, Timo & Hülsewig, Oliver, 2003. "The BMW model: A new framework for teaching monetary macroeconomics in closed and open economies," W.E.P. - Würzburg Economic Papers 34, University of Würzburg, Chair for Monetary Policy and International Economics.
    3. repec:got:cegedp:27 is not listed on IDEAS

    More about this item

    Keywords

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

    JEL classification:

    • A2 - General Economics and Teaching - - Economic Education and Teaching of Economics
    • E1 - Macroeconomics and Monetary Economics - - General Aggregative Models
    • E5 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit
    • F41 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Open Economy Macroeconomics

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