In every country it always is and must be the interest of the great body of the people to buy whatever they want of those who sell it cheapest. The proposition is so very manifest, that it seems ridiculous to take any pains to prove it; nor could it ever have been called in question, had not the interested sophistry of merchants and manufacturers confounded the common sense of mankind.
Adam Smith, An Inquiry into the Nature and Causes of the Wealth of Nations (1776).
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Adam Smith
