This paper uses a consumer theory-based systemic approach to model the demand for monetary liquid asset holdings. We implement the suggestions and caveats of aggregation theory for the estimation of a demand system for liquid assets (monies) in static, dynamic and time-varying parameters setups. Our results are robust and theoretically consistent with consumer theory restrictions, as system derived from a utility maximizing framework and a well-behaved utility function. In our estimations we find stability of interest-rate and total-expenditure elasticities, in contrast to previous literature. We also document evidence that long (short) maturity rates are associated to less (more) liquid assets and that the vigorous growth of M1 during the last five of years is not accounted for by low interest rates alone. Policy implications are straightforward; there is stable relationship between monies and interest rates, but the former do not respond exclusively to the latter.
