The Wealth of Nations by Part 4 Chapter 5 Page 8

occasions in years of plenty must frequently hinder more or less the plenty of one year from relieving the scarcity of another.

Both in years of plenty and in years of scarcity, therefore, the bounty necessarily tends to raise the money price of corn somewhat higher than it otherwise would be in the home market.

That, in the actual state of tillage, the bounty must necessarily have this tendency will not, I apprehend, be disputed by any reasonable person. But it has been thought by many people that it tends to encourage tillage, and that in two different ways; first, by opening a more extensive foreign market to the corn of the farmer, it tends, they imagine, to increase the demand for, and consequently the production of that commodity; and secondly, by securing to him a better price