The purpose of this paper is to investigate whether the impact of the Japanese yen on the values of East Asian currencies has increased since the 1997 East Asian financial crisis. In particular, this paper focuses on four crisis-affected countries: Indonesia, the Republic of Korea, the Philippines and Thailand. To this end, this paper estimates the weights of the Japanese yen in the determination of the values of the East Asian currencies using daily exchange rate data sets covering the pre-crisis period from January 1990 to June 1997 and the post-crisis period from January 1999 to June 2003. Empirical test results indicate that the impact of the Japanese yen on East Asian currencies has increased since the crisis. The null hypothesis that the weight of the Japanese yen remains the same is rejected for all four countries examined, supporting the alternative that it has increased since the financial crisis.
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