Mikey and Dom are roommates. They spend most of their time studying, but they leave some time for their favorite activities: making pizza and brewing root beer. Dom takes 4 hours to brew a gallon of root beer and 2 hours to make a pizza. Mikey takes 6 hours to brew a gallon of root beer and 4 hours to make a pizza.

1. What is each roommate's opportunity cost of making a pizza? Who has the absolute advantage in making pizza? Who has the comparative advantage in making pizza?
2. If Dom and Mikey trade foods with each other, who will trade away pizza in exchange for root beer?
3. Why is trade important in this scenario?