In fact, the push for better education is an experiment that has already been carried out globally. And, as my Harvard colleague Lant Pritchett has pointed out, the long-term payoff has been surprisingly disappointing.
事实上，推动更好教育的试验已经在全球范围内进行。而且，就像我在哈佛的同事 兰特·普里切特已经指出的那样，这项试验出乎意料地取得了令人失望的长期效果。