Here is an article that shows that higher pay only increases performance until a point, then performance drops: http://eganassociates.com.au/high-ceo-pay-inspires-better-pe... These results came from data that compared CEO remuneration to average employee remuneration. This directly contradicts what Gizi was proposing, because the real world data shows a negative correlation between CEO pay and performance after a point. The full paper is available here http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2529112 if anyone is interested in it.
Consider the GFC, it shows how well upper management really stuffed things up at the largest companies and still got away with it, no problems, still getting huge payouts for sub par leadership. Yet when things go well, the CEO gets bonuses for things that may have had nothing to do with them. Random fluctuations are wrongfully attributed to CEOs, and they get hefty bonuses for it as well. Here is a study that shows this http://www.sciencedaily.com/releases/2015/10/151022192337.ht... , unfortunately the original source is behind a paywall so I am not linking it.