Which of these countries' growth rates of real GDP per person have exceeded the United States' growth rate of real GDP per person over the last century?

The long-run aggregate supply curve occurs at the level of real GDP consistent with

A) no inflation. B) the natural rate of unemployment. C) individuals' tastes and preferences. D) low levels of inflation.

Voluntary exchange increases economic efficiency

A) because neither the buyer nor the seller would agree to a trade unless they both benefit. B) because voluntary exchange only takes place with government permission. C) because it is free and consequently does not cost anything. D) because it allows wealthy individuals to act altruistically and give to the poor.