The accompanying table shows data from the World Bank, World Development Indicators, for real GDP per capita in 2010 U.S. dollars for Argentina, Ghana, South Korea, and the United States for 1960, 1980, 2000, and 2015.

a. Complete the table by expressing each year’s real GDP per capita as a percentage of its 1960 and 2015 levels.

b. How does the growth in living standards from 1960 to 2015 compare across these four nations? What might account for these differences?

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Argentina Percentage of Ghana Percentage of South Korea United States Percentage of Percentage of Year Real 1960 2015 Real 1960 2015 Real 1960 2015 Real 1960 2015 GDP real real GDP real real GDP real real GDP real real per GDP GDP per GDP GDP per GDP GDP per GDP GDP capita per per capita per per capita per per capita per per (2010 capita capita (2010 capita capita (2010 capita capita (2010 capita capita dollars) dollars) dollars) dollars) 1960 $5,853 ? ? $1,053 ? ? $1,103 ? ? $17,037 ? ? 1980 8,408 ? ? 901 ? ? 3,911 ? ? 28,734 ? ? 2000 8,544 ? ? 975 ? ? 15,105 ? ? 45,056 ? ? 2015 12,128 ? ? 1,696 ? ? 25,023 ? ? 51,486 ? ?