Likewise with the inventory bend, by its very nature the idea of an interest bend expects that the buyer be an ideal contender that will be, that the buyer have no impact over the market cost. This is valid in light of the fact that each point on the interest bend responds to the inquiry. "Assuming purchasers are confronted with this possible value, the amount of the item will they buy?" But, assuming a purchaser has market power {that is, the sum he purchases impacts the value), he isn't "confronted with" some random cost, and we should utilize a more convoluted model, of monopsony