I don't get it. Are there any sources for this?
Are you saying the more people get paid the less work they do? This doesn't make sense to me. This sounds like a management and hiring issue. If someone doesn't want to work, you replace them with someone who does. Don't hire lazy fucks, hire competent people.
If I had a job that pays say 1 million a year, and I know I won't be able to get paid nowhere near as much at another company, I would make sure I work hard enough not lose that amazingly paid job, because otherwise I will have to work for half that and give up my rich lifestyle.
Again, a management issue for letting employees become zombies and a hiring issue for hiring lazy bums.