Suppose the price of a pound of flax seed is currently $1.20 in both Kentucky and West Virginia. Further, suppose there is a decrease in demand for flax seed in Kentucky, but not in West Virginia. Before flax seed sellers are able to adjust the relative quantity of flax seed supplied in the two states, the decrease in demand causes the equilibrium price of a pound of flax seed in Kentucky to change by $0.20. The law of one price suggests that the price of a pound of flax seed will be in West Virginia after sellers adjust the relative quantity of flax seed supplied in the two states.

T-comm makes a variety of products. it is organized in two divisions, north and south. the managers for each division are paid, in part, based on the financial performance of their divisions. the south division normally sells to outside customers but, on occasion, also sells to the north division. when it does, corporate policy states that the price must be cost plus 20 percent to ensure a "fair" return to the selling division. south received an order from north for 300 units. south's planned output for the year had been 1,200 units before north's order. south's capacity is 1,500 units per year. the costs for producing those 1,200 units follow