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本書追溯了獨佔理論的演變,從 Ricardo(1817)到 Hotelling(1929),再到 Robinson(1953),發現經濟租值,即額外利潤,計量變得越來越小。Ricardo 的經濟租值是全部租金,因為土地是免費的,而 Robinson 的最小,因其受到負需求和正供給所限制。本書證明了 Hotelling 的負線不是需求,並認為真正的獨佔者總是可以將全部成本轉嫁給買家,從而恢復 Robinson 的經濟租值到其完整的李嘉圖水平。因此,本書推翻了羅賓遜的專賣理論、其相對應的專買及相邊獨佔理論、以及所有價格歧視理論。