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Figure4-13Reallocating Sales Lowers Producer Surplus Yvonne (point Y) has a cost of $35, $10 more than Xavier (point X), who has a cost of $25. At the market equilibrium price of $30, Xavier sells a used book but Yvonne does not. If we rearrange sales by preventing Xavier from selling his used book and compelling Yvonne to sell hers, producer surplus declines by $10 and, as a result, total surplus declines by $10.