National saving and investment rates are highly positively correlated
in virtually all countries. This is puzzling, as it apparently implies
a low degree of international capital mobility. This paper shows that
the observed positive correlation between national saving and investm
ent rates arises naturally within a quantitatively restricted equilibr
ium model with perfect mobility of financial and physical capital. The
model is consistent with the fact that saving - investment correlatio
ns are larger for larger countries but are still substantial for small
countries. Further, the model is consistent with the finding that cur
rent-account deficits tend to be associated with investment booms.