If the consumption of a good decreases the quantity available for another person, the good is rival

Which of the following is a widely used measure of the standard of living?

(a) Nominal output per person employed; (b) Nominal output per head of population; (c) Real income per head of population; (d) Real output per unit of capital.

Which of the following contribute to high levels of U.S. production?

a. Immigration restrictions. b. Barriers to trade. c. Labor-intensive production. d. Abundant factors of production.