we can do some simple maths. In the US the share of the 1% has increased from about 8% at the end of the 70s to nearly 20% today. If that has had no impact on aggregate GDP but is just a pure redistribution, this means that the average incomes of the 99% are 15% lower as a result. The equivalent 1% numbers for the UK are 6% and 13% (although as the graph shows, that 13% looks like a temporary downward blip from something above 15%), implying a 7.5% decline in the average income of the remaining 99%. - http://mainlymacro.blogspot.com/2014/08/inequality-and-common-pool-problem.html