Chart 5: Human capital and economic growth  Sources: Barro-Lee (2010); World Bank, WDI database. 8  BIS Review 139/2010  Chart 6: Growing wage premium to high skilled labour and wage differential in the US  Sources: Goldin and Katz (2007). Note: “College graduate wage premium” is based on the college / high school wage differential (in logs).
“High school graduate wage premium” is based on the high school / eighth grade wage differential (in logs). Chart 7: Relative earnings from employment, by level of educational attainment for 25-64 year-olds, 2007  Source: OECD. Note: upper secondary and post-secondary non-tertiary education = 100.