Home Production Possibilities Frontier The Home PPF is a straight line between 50 yards of cloth and 100 bushels of wheat. The slope of the PPF equals the negative of the opportunity cost of wheat; that is, the amount of cloth that must be given up ( yard) to obtain 1 more bushel of wheat. Equivalently, the magnitude of the slope can be expressed as the ratio of the marginal products of labor for the two goods.