The difference between bid and ask is the profit for the dealer and the bid-ask spread is the profit for the dealer.

中间商的利润来自出价和要价的差别,差价就是中间商的利润

耶鲁公开课 - 金融市场课程节选

we're not going to talk about the funeral industry in America and how it rips off people, which it does, in their moments of grief and weakness and overcharges them for the various things that it offers.

我们也不会讨论美国的丧葬行业,以及他们如何敲诈百姓，实际上就是这样，在他们悲伤脆弱的时候,对他们提供的各种服务漫天要价。

耶鲁公开课 - 死亡课程节选