The Wealth of Nations by Part 4 Chapter 5 Page 114

endeavoured to prove them to be, the sooner they cease, and the lower they are, so much the better.

The same statute permits, at the lowest prices, the importation of corn, in order to be exported again duty free, provided it is in the meantime lodged in a warehouse under the joint locks of the king and the importer. This liberty, indeed, extends to no more than twenty-five of the different ports of Great Britain. They are, however, the principal ones, and there may not, perhaps, be warehouses proper for this purpose in the greater part of the others.

So far this law seems evidently an improvement upon the ancient system.

But by the same law a bounty of two shillings the quarter is given for the exportation of oats whenever the price does not exceed fourteen shillings.