The U.S. and Canada can both produce boots and shirts. A worker in the U.S. can make 12 shirts or 4 pairs of boots in a day. A worker in Canada can make 6 shirts or 6 pairs of boots in a day. When there is no trade, each country divides its workers' time equally show a Canadian worker will produce 3 shirts and 3 pairs of boots and an American worker will produce 3 shirts and 3 pairs of boots. What is the opportunity cost for each good in each country? Who has a comparative advantage in what good? What is the trading range?