Country A’s growth rate in per capita real gross domestic product (GDP) has been consistently higher than that of Country B. Which of the following factors can account for these differences in the per capita GDP growth rates?
A. Country B’s government gives more investment tax credits.
B. The labor force of Country A is becoming more skilled than the labor force of Country B.
C. The natural rate of unemployment is higher in Country A.
D. Country A’s central bank is less effective at controlling the inflation rate.