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The possible trinity: Optimal interest rate, exchange rate, and taxes on capital flows in a DSGE model for a small open economy

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  • Escudé, Guillermo J.

Abstract

A traditional way of thinking about the exchange rate (XR) regime and capital account openness has been framed in terms of the 'impossible trinity' or 'trilemma', in which policymakers can only have 2 of 3 possible outcomes: open capital markets, monetary independence and pegged XRs. This paper is an extension of Escude (A DSGE Model for a SOE with Systematic Interest and Foreign Exchange Policies in Which Policymakers Exploit the Risk Premium for Stabilization Purposes, 2013), which focused on interest rate and XR policies, since it introduces the third vertex of the 'trinity' in the form of taxes on private foreign debt. These affect the risk-adjusted uncovered interest parity equation and hence influence the SOE's international financial flows. A useful way to illustrate the range of policy alternatives is to associate them with the faces of a triangle. Each of 3 possible government intervention policies taken individually (in the domestic currency bond market, in the FX market, and in the foreign currency bonds market) corresponds to one of the vertices of the triangle, each of the 3 possible pairs of intervention policies corresponds to one of its 3 edges, and the 3 simultaneous intervention policies taken jointly correspond to its interior. This paper shows that this interior, or 'possible trinity' is quite generally not only possible but optimal, since the CB obtains a lower loss when it implements a policy with all three interventions.

Suggested Citation

  • Escudé, Guillermo J., 2014. "The possible trinity: Optimal interest rate, exchange rate, and taxes on capital flows in a DSGE model for a small open economy," Economics - The Open-Access, Open-Assessment E-Journal (2007-2020), Kiel Institute for the World Economy, vol. 8, pages 1-58.
    • Handle: RePEc:zbw:ifweej:201425
    DOI: 10.5018/economics-ejournal.ja.2014-25
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    1. Gali­, Jordi & Monacelli, Tommaso, 2008. "Optimal monetary and fiscal policy in a currency union," Journal of International Economics, Elsevier, vol. 76(1), pages 116-132, September.
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    Cited by:

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    2. Agénor, Pierre-Richard & Jia, Pengfei, 2020. "Capital controls and welfare with cross-border bank capital flows," Journal of Macroeconomics, Elsevier, vol. 65(C).
    3. Solikin M. Juhro, 2023. "Future Central Banking In Emerging Market Economies," Working Papers WP/01/2023, Bank Indonesia.
    4. Yugang He & Zhuoqi Teng, 2024. "Navigating Uncharted Waters: The Transformation of the Bank of Korea’s Monetary Policy in Response to Global Economic Uncertainty," Mathematics, MDPI, vol. 12(11), pages 1-24, May.
    5. Yin, Zhichao & Peng, Hongfeng & Xiao, Weiguo & Xiao, Zumian, 2022. "Capital control and monetary policy coordination: Tobin tax revisited," Research in International Business and Finance, Elsevier, vol. 59(C).
    6. Gudmundsson, Gudmundur S. & Zoega, Gylfi, 2016. "A double-edged sword: High interest rates in capital control regimes," Economics - The Open-Access, Open-Assessment E-Journal (2007-2020), Kiel Institute for the World Economy, vol. 10, pages 1-38.

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    Keywords

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    JEL classification:

    • E58 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Central Banks and Their Policies
    • F38 - International Economics - - International Finance - - - International Financial Policy: Financial Transactions Tax; Capital Controls
    • O24 - Economic Development, Innovation, Technological Change, and Growth - - Development Planning and Policy - - - Trade Policy; Factor Movement; Foreign Exchange Policy

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