The Wealth of Nations by Part 4 Chapter 5 Page 104

ever be exposed to either of these calamities, the scarcity of any one country being more likely to be relieved by the plenty of some other. But very few countries have entirely adopted this liberal system. The freedom of the corn trade is almost everywhere more or less restrained, and, in many countries, is confined by such absurd regulations as frequently aggravate the unavoidable misfortune of a dearth into the dreadful calamity of a famine. The demand of such countries for corn may frequently become so great and so urgent that a small state in their neighbourhood, which happened at the same time to be labouring under some degree of dearth, could not venture to supply them without exposing itself to the like dreadful calamity.

The very bad policy of one country may thus render it in some measure dangerous and imprudent