Will more higher education improve economic growth?
检验了扩大高等教育能否加速经济增长的命题，发现认知技能（知识资本）能解释各国增长差异，但仅增加受教育年限而不提升认知技能对增长影响甚微。
Calls for expanded university education are frequently based on arguments that more graduates will lead to faster growth. Empirical analysis does not, however, support this general proposition. Differences in cognitive skills—the knowledge capital of countries—can explain most of the differences in growth rates across countries, but just adding more years of schooling without increasing cognitive skills historically has had little systematic influence on growth.