There's a somewhat famous UK guy called Charlie Mullins who runs a plumbing Business called Pimlico Plumbers. I saw a clip the other day where he does this experiment with his own business, and the cameras film people finding out what their colleagues are earning. Some people feel quite shafted, others don't want to talk about it. In the end there's a not so satisfying solution. Or at least one that papers over the problem: they find some savings from their suppliers and give the money to the lower paid staff.

But I thought it was an interesting experiment to watch.