The Wealth of Nations by Part 4 Chapter 5 Page 105

to establish what would otherwise be the best policy in another. The unlimited freedom of exportation, however, would be much less dangerous in great states, in which the growth being much greater, the supply could seldom be much affected by any quantity of corn that was likely to be exported. In a Swiss canton, or in some of the little states of Italy, it may perhaps sometimes be necessary to restrain the exportation of corn. In such great countries as France or England it scarce ever can. To hinder, besides, the farmer from sending his goods at all times to the best market is evidently to sacrifice the ordinary laws of justice to an idea of public utility, to a sort of reasons of state; an act of legislative authority which ought to be exercised only, which can be pardoned only in cases of the most urgent necessity.