… is from page 28 of F.A. Hayek’s great 1973 essay “Liberalism” as this essay appears as chapter one of Essays on Liberalism and the Economy (2022), which is volume 18 (expertly edited by Paul Lewis), of The Collected Works of F.A. Hayek:
The test of the justice of any particular rule is thus whether its universal application is possible because it proves to be consistent with all the other accepted rules.
DBx: By this criterion, protectionism is unjust in a society in which an accepted rule is that the income that each person earns belongs to him or her and is free to be spent by that person in whatever peaceable ways he or she chooses.