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Adam Smith (1817). “An inquiry into the nature and causes of the wealth of nations0: With a life of the author : Also a view of the doctrine of Smith, compared with that of the french economists ...”, p.19
Adam Smith (1843). “An Inquiry Into the Nature and Causes of the Wealth of Nations With a Life of the Author: Also a View of the Doctrine of Smith, Compared with that of the French Economists, with a Method of Facilitating the Study of His Works, from the French of M. Jariner”, p.177