Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Given worldwide trends in education, wage premium for schooling, and real GDP, we derive a lower bound for the long-run elasticity of labor substitution across schooling groups of around 4, which is far higher than values commonly used in the literature. We exploit our bound to reexamine the importance of human capital in cross-country income differences, including the roles of school quality versus the skill bias of technology in the greater efficiency gains from schooling in richer countries.