China’s Students Are Catching Up In both China and Argentina, the average educational level—measured by the number of years the average adult aged 25 or older has spent in school—has risen over time. Although China is still lagging behind Argentina, it is catching up—and China’s success at adding human capital is one key to its spectacular long-run growth. Source: Robert Barro and Jong-Wha Lee, “A New Data Set of Educational Attainment in the World, 1950–2010,” NBER Working Paper No. 15902 (April 2010), http://www.barrolee.com.