No country can develop without an efficient financial system and Mexico has been no exception to the rule. In 1965, private and public banks’ claims on the rest of the economy amounted to close to eighty billion pesos, or about one-third of gross national product. In recent years, moreover, the banking system has been highly instrumental in mobilizing domestic savings, as well as in channeling to the economy additional resources from the rest of the world. Its role, then, has been of crucial significance for the economic development of the country.