If either side is happy then there's an inequity. Or you might get into the position where the employer and employee think they got a great deal. I've heard of

If either side is happy then there's an inequity. Or you might get into the position where the employer and employee think they got a great deal. I've heard of it happen before. In any case, making sure neither side is happy is not really any way to ensure that there's no inequity.