If Country A can produce 50 tons of rice or 100 tons of wheat, and Country B can produce 30 tons of rice or 90 tons of wheat, which country has a comparative advantage in rice production?

To determine which country has a comparative advantage in rice production, we need to look at how much of each crop each country gives up to produce rice. Country A can produce 50 tons of rice or 100 tons of wheat, so for every ton of rice, it gives up 2 tons of wheat. On the other hand, Country B can produce 30 tons of rice or 90 tons of wheat, meaning it gives up 3 tons of wheat for every ton of rice. Since Country A gives up fewer tons of wheat per ton of rice produced, it has a comparative advantage in rice production. Thus, Country A should focus on producing rice while Country B should focus on wheat to make the most efficient use of their resources.