A good question, from the early sixteenth century (from Thomas More’s Utopia):
what justice is there in this: that a nobleman, a goldsmith, a banker, or any other man, that either does nothing at all, or, at best, is employed in the things that are of no use to the public, should live in great luxury and splendour upon what is so ill acquired, and a mean man, a carter, a smith, or a ploughman, that works harder even than the beasts themselves, and is employed in labours so necessary, that no commonwealth could hold out a year without them, can only earn so poor a livelihood and must lead so miserable a life, that the condition of the beasts is much better than theirs?
I don’t propose compulsory rearrangement of pay scales (not necessarily, anyway!), but how foolish it is to value people by the measure of their salary.