ABSTRACTThe effectiveness of monetary and fiscal policy actions is partially dependent upon the degree of isolationism of the U.S. money markets. This paper extends the study of capital market integration by investigating the relationships between yields on various currency denominated deposits. The only identified impact of changes in U.S. dollar yields, at home or abroad, on other currency returns is through contemporaneous determination; no direct causality from U.S. to foreign yields is indicated. Several significant reverse causality relationships, however, are evident.