"Education Indicators in Focus" is a recurring series of briefs that highlight specific indicators in "OECD's Education at a Glance" that are of particular interest to policy makers and practitioners. They provide a detailed look into current issues in pre-primary, primary and secondary education, higher education, and adult outcomes from a global perspective, and contain an engaging mix of text, tables and charts that describe the international context of the most pressing questions in education policy and practice. This brief reports that between 2000 and 2009, total expenditure on educational institutions as a percentage of GDP rose by 0.88 percentage point from 5.34% to 6.22%; the increase came from both public and private sources. In OECD countries, 16.0% of total educational expenditure for all levels of education came from private sources in 2009, compared to 12.2% in 2000. The private share in expenditure increased from 22.9% to 30.0% on average at the tertiary level, whereas it increased from 7.1% to 8.8% at primary, secondary and post-secondary non-tertiary levels. The increase in private expenditure was not tied to a decrease in public spending on education. Rather, both sources of education expenditure had different growth rates. At the country level, a higher share of private expenditure for tertiary education institutions is not associated with more limited access to tertiary education or decreasing opportunities for students from disadvantaged families to enrol in tertiary education.