A nation achieves economic growth when its production possibilities frontier shifts outward.
Option C is correct.
Economic growth measured as an increase of person real income refers to that the ratio between people's income and the prices of what they can purchase is increasing: goods and services become more affordable, people becomes less poor.
There are two main sources of economic growth: growth in the size of the workforce and growth in the productivity of that workforce. Either can increased the overall size of the economy but strong productivity growth may increase per capita GDP and income.
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