Human Capital and Growth: An Alternative Accounting

Abstract This paper re-examines the importance of human capital in explaining economic growth. Previous studies are extended by including schooling investments of both time and goods within the school year, a human capital externality, and imperfect substitution between white collar and manual tasks. The model of worker productivity used to conduct the growth accounting is consistent with (1) rates of return to time and goods investment in education, (2) white collar wage premia, and (3) trendless worker productivity growth rates in the United States over the 20th century. The analysis suggests that about one third of United States growth over this period was related to human capital accumulation, accounting for an average annual growth rate of 0.6 to 0.7 percent. The model also implies that neoclassical inputs can account for 5.5 to 8.5-fold differences in worker productivity across rich and poor countries.