If we arrange the WTP values from high to low and the cost values from low to high, we can use the data to plot the diagram to the right. Q WTP Costs 1 20 1 2 18 2 3 17 4 4 14 5 5 14 7 6 13 8 7 12 11 8 11 12 9 9 12 10 8 12 Part 3 What is the total gain that can be realized on the sale (by sellers) and purchase (by buyers) of the 4th unit of this good? $ 9. (Hint: use the data in the table above to compute the gain.) Part 4 Will this unit be traded? Yes. No