A Revisit on the Validity of the Uncovered Interest Rate Parity-Evidence from Time-Varying Parameter Models.

This paper develops two time-varying parameter uncovered interest parity (TVP-UIP) models and studies their validity in both developed and emerging countries. Compared to the traditional models, TVP-UIP models can successfully capture dynamic relationships and help to explain the UIP puzzle. Empirical results show that the coefficients vary substantially over time and the UIP relationship can be regarded as a dynamic equilibrium process especially in emerging economies. The UIP hypothesis holds in several periods and can be significantly affected by specific major events, such as the financial crises and the recovery policies in response to it, or the US monetary policy changes. The time-varying risk premium attracts great concern in the literature but only plays a limited role in this case. Moreover, the failure of UIP in some periods can be attributable to the persistence inherent in the data, which leads to a long-lasting re-establishment of the UIP relationship after a shock. [ABSTRACT FROM AUTHOR]