But it is possible to find in the work of Robert Torrens earlier — though less complete — statements of this theory: the reader interested in problems of historical priority should consult Viner (1937) and Chipman (1965).doi:10.1007/978-3-642-37314-5_2Giancarlo Gandolfo...
Patten, S.N. 1893. The interpretation of Ricardo.Quarterly Journal of Economics. As reprinted in S.N. Patten,Essays in economic theory, reprinted, Port Washington/London: Kennikat Press, 1971. Google Scholar Robbins, L. 1952.The theory of economic policy in English classical political economy....
. The Smith-Ricardo simple labor theory 5 holds in autarky. But when a world market is established, and the prices of the two goods are the same everywhere, it must be that (2) a 1 /a 2 ≤ p 1 /p 2 ≤ a 1 */a 2
Lecture Notes in International Trade Theory:Classical Trade and ApplicationsLarry S KarpUniversity of California, Berkeley, USA