Large Differences in Human Capital Between Poor and Rich Countries

Large differences in human capital between poor and rich countries:

A) cannot explain the lack of convergence in per capita incomes between poor and rich countries.
B) may explain why per capita incomes in poor countries have begun to converge with those in rich countries.
C) may explain why per capita incomes in poor countries have not converged with those in rich countries.
D) cannot explain why rich countries continue to grow at rates that are similar to those in poor countries.