1970s, Economics for the Citizen (1978)
Context: there's the claim that this or that price is unreasonable. I used to have conversations about this claim with Mrs. Williams early on in our 44-year marriage. She'd return from shopping complaining that stores were charging unreasonable prices. Having aired her complaints, she'd ask me to go out and unload a car trunk loaded with groceries and other items. Having completed the chore, I'd resume our conversation, saying, "Honey, I thought you said the prices were unreasonable. Are you an unreasonable person? Only an unreasonable person would pay unreasonable prices." The long and short of it is that the conversation never went over well, and we both ceased discussions of reasonable or unreasonable prices. The point is that whatever price a transaction is transacted at represents a meeting of the mind of both buyer and seller. Both viewed themselves as being better off than the next alternative -- not making the transaction. That's not to say that the seller wouldn't have found a higher price more pleasing or the buyer wouldn't have been pleased with a lower price.
“Every transaction in commerce is an independent transaction.”
Source: The Principles of Political Economy and Taxation (1821) (Third Edition), Chapter VII, On Foreign Trade, p. 85
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David Ricardo 37
British political economist, broker and politician 1772–1823Related quotes

Brownlow v. Egerton (1854), 23 L. J. Rep. Part 5 (N. S.), Ch. 365.

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Slaves of Time (p. 16)
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Source: Knowledge Assets, 1998, p. 124; As cited in: Ortiz et al. (2006)

Source: Why Our Drug Laws Have Failed and What We Can Do About It: A Judicial Indictment of the War on Drugs, 2011, p. 53

“Make your interactions with people transformational, not just transactional.”
Variant: To summarize, the production of information and its use in transactions both incur costs and are thus subject to economizing. In the 1970s, there occurred a revival of interest among economists in the economics of transaction, and Oliver Williamson in particular, building on the earlier work of Ronald Coase and John Commons, has explored the different institutional arrangements that govern transactional choices.
Source: Knowledge Assets, 1998, p. 235