Jean Baptiste Say By 0scsha78_newo 1767 Say was born in Lyon, France to a protestant family. 1785 Say was sent with his brother to England to complete his education. 1803 His book, A Treatise on Political Economy, was published. In it, he outlines his famous Law of Markets. 1807 Say opened a cotton-spinning mill business. 1813 He sold his cotton-spinning business and joined the National Conservatory of Arts and Crafts. 1832 Died in Paris, France at the age of 65.