Suppose there are two states that do not trade: Iowa and Nebraska. Each state produces the same two goods: corn and wheat. For Iowa the opportunity cost of producing 1 bushel of wheat is 3 bushels of corn. For Nebraska the opportunity cost of producing 1 bushel of corn is 3 bushels of wheat. At present, Iowa produces 20 million bushels of wheat and 120 million bushels of corn, while Nebraska produce 20 million bushels of corn and 120 million bushels of wheat.
a. Explain how, with trade, Nebraska can end up with 40 million bushels of wheat and 120 million bushels of corn while Iowa can end up with 40 million bushels of corn and 120 million bushels of wheat.