This division of labour, from which so many advantages are derived, is not originally the effects of any human wisdom, which forsees and intends that general opulence to which it gives occasion. It is the necessary, though very slow and gradual consequence of a certain propensity in human nature which has in view no such extensive utility; the propensity to truck, barter, and exchange one thing for another.
Jonathan B. Wight,
Does Free Trade Cause Hunger? Hidden Implications of the FTAA,
Rich. J. Global L. & Bus.
Available at: http://scholarship.richmond.edu/global/vol2/iss2/6