David Ricardo,
On The Principles of Political Economy…
“ You increase not only the nominal, but the real profit, the real wealth and revenue of those manufacturers—you really encourage those manufactures. But when, by the like institutions, you raise the nominal or money price of corn, you do not raise its real value, you do not increase the real wealth of our farmers or country gentlemen, you do not encourage the growth of corn. The nature of things has stamped upon corn a real value, which cannot be altered by merely altering its money price. Through the world in general, that value is equal to the quantity of labour which it can maintain. ”
