Two countries produce milk and dairy products efficiently. Neither has an absolute advantage. However, Country A exports milk to Country B, and Country A imports cotton from Country B. Which of the following is inferred? The opportunity cost of producing milk is lower for Country A. The opportunity cost of producing cotton is higher for Country B. Country A has a natural resource advantage in cotton. Country B has a natural resource advantage in milk.

Two gymnastics teams are intense rivals. the first team has started recruiting new gymnasts from different cities and even foreign countries in an effort to build a stronger team. after learning this, the second team begins its own recruitment campaign to find even better gymnasts. over a period of months, each team recruits dozens of players, each time trying to find a better recruit than its rival's most recent addition. which idea from the cold war is most similar to this scenario?