【单选题】Rancher Tom can raise 1 5 goats and 30 pigs in a year. Rancher Joe can raise 30 goats and 1 5 0 pigs in a year. Who has the comparative advantage for raising pigs?
【单选题】Rancher Tom can raise 10 goats and 20 pigs in a year. Rancher Joe can raise 20 goats and 100 pigs in a year. Who has the comparative advantage for raising pigs?