A cospectral analysis of exchange rate comovements during Asian financial crisis

Comovements of exchange rates before and during Asian financial crisis are examined using cross-spectral methodology. The paper proposes and implements a simple frequency-domain-based test for contagion that avoids biases of the correlation breakdown tests used in the extant literature. The Asian crisis is found to be manifest in greater comovements along high-frequency components. Calculated changes in the high-frequency portion of the covariance indicate a contagion for 48 out of the possible 66 pairs of countries in the sample.