When a firm retains earnings for investment purposes, it is effectively saving on behalf of its shareholders.

The indifference curves in the above figure could represent your indifference curves between

A) Coke and Pepsi, which you consider perfect substitutes. B) eyeglass frames and eyeglass lenses, which you think are perfect complements. C) hot dogs and textbooks, which you think are neither perfect substitutes nor perfect complements. D) none of the above.

Differences in the productivity of labor accounts for comparative advantage if:

a. the minimum wage varies across countries. b. the size of the domestic market varies across countries. c. the labor hours required to produce each good varies across countries d. the strength of workforce varies across countries. e. the laborers are paid different wages in different countries.