Estimates of productivity levels and GDP per capita permit the comparison of standards of living and underlying factors across countries. The OECD estimates are based on GDP and employment from the OECD Annual National Accounts and on hours worked from the OECD Employment Outlook, the OECD Annual National Accounts and national sources. Estimates of productivity levels are more uncertain than estimates of productivity growth, and the measures should be interpreted with caution. Productivity Graph: Breakdown GDP per Capita