“For the problem is not simply that Smith was not the founder of economics.
The problem is that he originated nothing that was true, and that whatever he originated was wrong; that, even in an age that had fewer citations or footnotes than our own, Adam Smith was a shameless plagiarist, acknowledging little or nothing and stealing large chunks, for example, from Cantillon.”

(…)

For Smith not only contributed nothing of value to economic thought; his economics was a grave deterioration from his predecessors: from Cantillon, from Turgot, from his teacher Hutcheson, from the Spanish scholastics, even oddly enough from his own previous works, such as the Lectures on Jurisprudence (unpublished, 1762–63, 1766) and the Theory of Moral Sentiments (1759).

usw.

http://www.lewrockwell.com/rothbard/rothbard104.html