The following production possibilities schedule shows the quantities of buckwheat and corn that can be produced in the United States and Canada with one unit of equivalent resources. Buckwheat (bushels) 51 Corn (bushels) 12 United States Canada 25 7 For both countries to be able to gain from trade, Canada would not gain by producing and exporting corn and importing buckwheat unless it received OA more than 3 57 bushels of buckwheat per bushel of com OB any quantity of buckwheat o more than 7 bushels of corn OD more than 425 bushels of buckwheat por bushel of com