16

Estimation of equilibrium exchange rates is conducted for the three main Asian currencies (Japan, China, South Korea) with theoretical framework of Williamson [1994]. It highlights the problems of regional monetary cooperation that have gained momentum after the outbreak of the 1997-1998 financial crises in East Asia. The Chinese yuan became undervalued during the second part of the 1990s, which can explain its resistance faced with the Asian crisis. The yen became marked by contrast between a weak undervaluation against the dollar since 1998 and an overvaluation against the Chinese yuan since 1995 and Korean won since 1998. As for the Korean won, an overvaluation appeared before the Asian crisis, followed by an undervaluation compared to the dollar and yen. Persisting misalignments of these three currencies attest to the need for regional monetary cooperation. Estimated equilibrium exchange rates would be useful to set exchange rate parities at the launching of any new institutional arrangements (common basket peg policy, yen bloc, acu).