“Money is, in fact, only the instrument for carrying on buying and selling (but, if you please, what do you understand by buying and selling?) and the consideration of it no more forms a part of the science of political economy, than the consideration of ships, or steam engines, or of any other instrument employed to facilitate the production and distribution of wealth.” Th. Hodgskin, Popular Political Economy, etc. London, 1827, p. 178, 179.

A comparative study of the writings and characters of Petty and Boisguillebert, outside of the light which it would throw upon the difference of French and English society at the end of the seventeenth and the beginning of the eighteenth centuries, would disclose the origin of the national contrast between English and French Political Economy. The same contrast reasserts itself in Ricardo and Sismondi.