How should the relative importance of banks and stock markets change as countries develop? Is there an optimal financial structure—in other words, should the mixture of financial institutions and markets change to reflect the evolving needs of economies as they develop?
Previous research has found that both the operation of banks and the functioning of securities markets influence economic development (Demirguc-Kunt and Maksimovic, 1998; Levine and Zervos, 1998), suggesting that banks provide different services to the economy from those provided by securities markets. Indeed, banks generally have a comparative advantage in financing shorter term, lower risk, well collateralized investments, while arms length markets are relatively better suited in designing custom financing for more novel, longer run and higher risk projects.
However, economic theory also emphasizes the importance of financial structure, i.e., the mixture of financial institutions and markets operating in an economy. For example, Allen and Gale’s (2000) theory of financial structure and their comparative analyses of Germany, Japan, the United Kingdom, and the United States suggest that (1) banks and markets provide different financial services; (2) economies at different stages of economic development require different mixtures of these financial services to operate effectively; and (3) if an economy’s actual mixture of banks and markets differs from the “optimal” structure, the financial system will not provide the appropriate blend of financial services, with adverse effects on economic activity.