Sure, of course! But sometimes more money is not what you need to give to employees to motivate them to do better, or care more about your company (at least not directly).
That's correct, studies show that there is a huge gain in motivation until you hit the "right" amount. After that additional money does little (other than retention) but other factors matter far more. But if you are making way less than other people, you are below that "right" amount in nearly all cases.
True, but I prefaced the remarks about motivation by saying that one was already making the 'right' amount of money.