# 餐廳和戲院的付費意願差別,凸顯了「固定成本」和「邊際成本」在公平性和費力程度觀念中扮演的角色。固定成本(例如戲院座椅和燈光設備),激發我們做出回報的程度,不若邊際成本(例如主廚親手料理的鮮魚及蔬菜,或是菜鳥服務生端著托盤,上頭的玻璃杯還搖搖晃晃,引人嘲弄──各位,別這樣,真的很不禮貌。)——《金錢心理學》
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