The cost of production on the "bottom forty" is $100,000 for a given size crop. On the "north forty," due to erosion of the soil, the cost is $150,000. If both are being farmed by tenants, we would expect the rent on the "bottom forty" to be
a. $50,000 above the rent on the north forty.
b. different from that on the north forty by an indeterminable amount.
c. $50,000, and the rent on the north forty is $50,000.
d. $50,000 below the rent on the north forty.