Some writers maintain arithmetic to be only the only sure guide in political economy; for my part, I see so many detestable systems built upon arithmetical statements, that I am rather inclined to regard that science as the instrument of national calamity.

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Quote text and notes from Wikiquote: Jean-Baptiste Say (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.