# The Possible Trinity: Optimal interest rate,exchange rate, and taxes on capital flows in a DSGE model for a Small Open Economy

*Guillermo Escudé* ()

No 201563, BCRA Working Paper Series from Central Bank of Argentina, Economic Research Department

**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 Escudé (2012), 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 correspond 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.

**Keywords:** DSGE models; Small Open Economy; monetary and exchange rate policy; capital controls; optimal policy (search for similar items in EconPapers)

**JEL-codes:** E58 F38 O24 (search for similar items in EconPapers)

**Pages:** 46 pages

**Date:** 2015-03

**New Economics Papers:** this item is included in nep-cba, nep-dge, nep-mac, nep-mon and nep-opm

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http://www.bcra.gov.ar/Pdfs/Investigaciones/WP_63_2015e.pdf Versión en Español (application/pdf)

http://www.bcra.gov.ar/Pdfs/Investigaciones/WP_2015_63Escude_i.pdf English version (application/pdf)

**Related works:**

Journal Article: The possible trinity: Optimal interest rate, exchange rate, and taxes on capital flows in a DSGE model for a small open economy (2014)

Working Paper: The possible trinity: Optimal interest rate, exchange rate, and taxes on capital flows in a DSGE model for a small open economy (2014)

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**Persistent link:** https://EconPapers.repec.org/RePEc:bcr:wpaper:201563

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