“People of the same trade seldom meet together, even for merriment and diversion, but the conversation ends in a conspiracy against the public, or in some contrivance to raise prices. It is impossible indeed to prevent such meetings, by any law which either could be executed, or would be consistent with liberty and justice. But though the law cannot hinder people of the same trade from sometimes assembling together, it ought to do nothing to facilitate such assemblies, much less to render them necessary.” Adam Smith, Wealth of Nations
亞當•史密斯(Adam Smith)在《國富論》(Wealth of Nations)中寫道:「同業中人,會在一起,即令以娛樂消遣爲目的,言談之下,恐亦不免是對付公衆的陰謀,是抬高價格的策劃。想用某項能實施卻又不違反自由正義的法律,來阻止同業者不時的聚會,固屬難能,但立法使其便於集會,尤其是立法使其集會成爲必要,卻亦是錯誤的措施。」(郭大力、王亞南譯本——譯者注)