The Expenditure Composition Hypothesis: Empirical Evidence and Implications for Monetary Policy.

Leão (2005) has recently proposed a new explanation for the short run variability of the velocity of money based on the changes in the composition of the expenditure that occur along the business cycle. This paper presents further empirical evidence in favour of Leão’s Expenditure Composition Hypothesis, and draws new implications of this hypothesis for monetary policy. We use a VAR model to analyze the determinants of the velocity of both M1 and M3 in the USA. The main conclusion is that increases in the weight of investment and durable consumption in total expenditure raise the velocity of both narrow and broad money. This is in line with the Expenditure Composition Hypothesis. Furthermore, we draw a new implication of this hypothesis for monetary policy. The more a central bank’s decisions on the interest rate respond to money growth, the more volatile economic growth will be. In other words, a monetary policy strategy - like that of the ECB – which puts emphasis on money growth is de-stabilizing.