Sam farms a 400-acre farm. Two hundred acres of the land are particularly rich in a nutrient that is favorable to growing corn, but does not provide any extra benefits for wheat. Sam can grow 30 bushels of corn or 25 bushels of wheat on each of these special acres. The other 200 acres are not rich in the nutrient, so Sam can grow only 10 bushels of corn or the same 25 bushels of wheat per acre.
Plot Sam's production possibilities frontier for his entire farm. The data-plotting tool will automatically connect the points with a line. The frontier will have three points, one for devoting all of the land to corn, one for devoting all of the land to wheat, and one for devoting 200 acres to corn and 200 acres to wheat.