EXOGENOUS INTEREST RATE AND EXCHANGE RATE DYNAMICS UNDER ELASTIC EXPECTATIONS

A theory analyzing the short run dynamics of nominal exchange rates under exogenous interest rates and free imperfect international capital markets is presented. Introducing elastic exchange rate expectations leads to cumulative changes in the spot and forward exchange rates in the same direction. W...

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Bibliographic Details
Published in:Investigación económica 2021-10, Vol.80 (318), p.3-31
Main Authors: Serrano, Franklin, Summa, Ricardo, Aidar, Gabriel
Format: Article
Language:English
Subjects:
Capital markets
Elasticity
Floating exchange rates
Foreign exchange rates
Forward exchange
Interest rates
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Summary:A theory analyzing the short run dynamics of nominal exchange rates under exogenous interest rates and free imperfect international capital markets is presented. Introducing elastic exchange rate expectations leads to cumulative changes in the spot and forward exchange rates in the same direction. We find that free floating exchange rate regimes are intrinsically unstable, as the nominal exchange rate is an institutional or policy variable that has no ‘fundamental equilibrium’ level. Implications for monetary policy and exchange market interventions of this potential instability are derived. Our results help to explain both the empirical prevalence of dirty floating exchange rate regimes and some aspects of the uncovered interest parity ‘failure’. Presentamos un análisis teórico de la dinámica de corto plazo de los tipos de cambio nominales con tasas de interés exógenas y libres e imperfecta movilidad internacional de capitales. La introducción de expectativas de tipo de cambio elásticas conduce a variaciones acumulativas en los tipos de cambio spot y forward en la misma dirección. Los regímenes de tipo de cambio de flotación libre son intrínsicamente inestables, dado que el tipo de cambio nominal es una variable institucional o de política que no tiene un nivel de “equilibrio fundamental”. Derivamos implicaciones de esta inestabilidad potencial para la política monetaria y las intervenciones en los mercados cambiarios. Los resultados ayudan a explicar la prevalencia de tipos de cambio de flotación sucia y aspectos de la “falla” de la paridad de tasas de interés descubierta.
ISSN:0185-1667
2594-2360
DOI:10.22201/FE.01851667P.2021.318.80810