AP Microeconomics

A country produces only wheat and steel. Moving along its bowed-out production possibilities curve from a wheat-heavy point toward a steel-heavy point, the opportunity cost of each additional ton of steel

• Ais zero, because the economy is on the curve
• Bdecreases, because of economies of scale
• Cincreases, because resources are not equally suited to both goods
• Dstays constant, because the curve shows all efficient points

Choose an answer — the explanation appears right here.