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Say was born in Lyon, France to a protestant family.
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Say was sent with his brother to England to complete his education.
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His book, A Treatise on Political Economy, was published. In it, he outlines his famous Law of Markets.
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Say opened a cotton-spinning mill business.
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He sold his cotton-spinning business and joined the National Conservatory of Arts and Crafts.
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Died in Paris, France at the age of 65.