As noted by Gurley and Shaw, there is a typical pattern of economic de
velopment in which the evolution of the financial system is an essenti
al aspect of the growth process. We focus on one component of this evo
lution: the increasing importance of equity markets as an economy grow
s. We develop a growth model where capital accumulation is financed ex
ternally through a combination of debt and equity. We illustrate why e
quity market activity might grow - often very rapidly - as an economy
develops. We also illustrate why access to equity markets may not be n
eeded in the early stages of economic development.