This is the first broad cross-country assessment of the ties between financial structure--the mix of financial instruments, institutions, and markets in a given economy--and economic growth since Raymond Goldsmith's 1969 landmark study. Most studies focus on developed countries and compare bank-based and market-based systems. Debates over the relative merits of the two systems have relied on case studies of Germany, Japan, the United Kingdom, and the United States, countries with similar long-run growth rates. The absence of data on developing countries limits the usefulness of such studies for policy makers.The book contains recently acquired cross-country data from almost 150 countries. It includes information on the size, efficiency, and activity of banks, insurance companies, pension and mutual funds, finance companies, and stock and bond markets. It also incorporates information on each country's political, economic, and social environment. The chapters contain a mix of case studies, cross-country studies, macro- and micro-oriented approaches, and analytical and empirical work. The conclusions point not to markets versus banks, but to markets and banks. It is how well a financial system functions that is critical for long-run economic growth. The research suggests that strong legal rights for outside investors and the overall efficiency of contract enforcement are effective tools for developing the financial sector and the economy. The book includes a CD containing World Bank data.