In this article, we study the determinants of cross-country variation in th
e level of international reserves over the period 1981-1995. Confirming int
uition, trade openness is easily the most important variable. There is also
some evidence that financial deepening is associated with an increase in t
he reserves ratio. Smaller and more volatile industrial countries hold larg
er reserves than their larger, less volatile counterparts. In addition, mor
e indebted developing countries tend to have smaller reserve ratios. We vie
w these results as establishing some interesting stylized facts that may be
helpful in informing future theoretical modeling of reserves behavior.