The little data book on financial development 2013 presents a global database on financial systems in 203 countries. It measures the size, access, efficiency, and stability of financial institutions. The data show that a deep financial system doesn't always mean better access to financial services. Highly efficient systems may not be more stable. The global financial crisis increased instability and made it harder to access financial services. The findings highlight the importance of good data for understanding financial development and its impact on economic growth and poverty reduction.