Currency substitution, capital mobility and money demand

Abstract

This paper re-examines the currency substitution (CS) issue by specifying a general portfolio balance (PB) model where domestic residents' demand for foreign money is distinguished from their demands for foreign non-monetary assets. The latter possibility, which reflects international capital mobility as opposed to CS per se, is already a key feature in the open-economy macro literature. The inclusion of foreign money leaves the usual asset demand functions unchanged (in the PB model that ignores CS), at least as far as the appropriate rate-of-return arguments and their signs are concerned. Although this suggests that CS is of limited importance in macro modelling, it implication for the estimation of money demand functions is pursued. An initial attempt is made to empirically isolate the separate efects of high capital mobility and currency substitution for Canada, Germany, the United Kingdom, and the United States. The results, while not conclusive due to high multicollinearity problems, bring into question the empirical as well as the theoretical relevance of currency substitution.