This paper analyzes the demand for money in Argentina using the new open macroeconomic framework provided by the Redux Model. In a set up of this model with nontradable goods the fundamentals of money demand appear to be, not only, domestic product and interest rate, but also, net foreign assets revenues, productivity differential and terms of trade. These five fundamentals allow to estimate the demand for money in macroeconomic unstable economies like Argentina. We find that the transaction-elasticity and the interest-elasticity are similar to those of developed countries, and that the structural volatility of Argentina's money demand may be explained by external shocks trasmitted through foreign sector related elasticities.