"The commerce of minds was necessarily the first commerce in the world, ... since before bartering things one must barter signs, and it is necessary therefore that signs be instituted.There is no market or exchange without language. The first instrument of all commerce is language."

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Traditionally, marriage involved a kind of bartering, rather than mutual inter-dependence or role sharing. Husbands financially and economically supported wives, while wives emotionally, psychologically and socially supported husbands. He brought home the bacon, she cooked it. He fixed the plumbing, she the psyche.

— Bettina Arndt