I estimate a Solow model augmented with human capital in 42 countries for 1910–2000. Estimated TFP growth is 0.3%/year, and the steady-state rate for GDP/capita is 1.0%/year. Implicitly for high-income countries maintaining growth above this rate will be increasingly difficult.

PWT 7.0 data deviate substantially from PWT 6.3 data because the benchmarked prices for 1970 to 1996 used in PWT 6.3 were entirely discarded. PWT 7.0 data are unreliable and appear to be much less accurate than PWT 6.3 data.

This paper challenges Hanushek and Woessmann's (2008) contention that the quality and not the quantity of schooling determines a nation's rate of economic growth. I first show that their statistical analysis is flawed. I then show that when a nation's average test scores and average schooling...