… is from page 50 of Henry Hazlitt’s 1984 book, From Bretton Woods to World Inflation:
Each nation should abandon the fallacious idea that it is to its own advantage to inflate or devaluate, or that it gains when it erects huge tariff barriers or subsidizes exports or blocks its currency, or when it forbids its own citizens to export gold, capital, or credit. Each nation should abandon the fallacious idea, in short, that it gains when it makes economic war on its neighbor.