hich of the following is true of a constant-cost production-possibility curve? Question 9 options: A country with a constant-cost production-possibility curve partially specializes in the production of goods when it engages in free trade with other nations. A constant-cost production-possibilities curve is drawn as a positively sloped straight line. When a country engages in free trade, the constant-cost production-possibility curve shifts to the right. Along a constant-cost production-possibilities curve, the opportunity cost of producing more of a good is constant.