A resenting B says nothing about their relative merit, just about merit as perceived by A. A usually sees more merit in A than B, C or D. B, on the other hand,

A resenting B says nothing about their relative merit, just about merit as perceived by A. A usually sees more merit in A than B, C or D. B, on the other hand, tends to overstate B's merit. So no matter how wages are set, and regardless of disparities between salaries, people will find the wages unfair. In this sense equalization is bad because it reveals everyone's wage. The best is unknown inequality. Of course it has own its drawbacks, I was just pointing out this one angle.