The results raise several questions about what causes what: Is the stinginess of the rich actually responsible for the inequities in states with high inequality?
"These factors mean that high inequality can generate further high inequality and eventually poor economic growth," Professor Katz said.
Countries such as China and Russia, with similarly high inequality, have more scope for increasing redistribution.
A few low-growth countries (notably Mexico and Turkey) have high inequality.
Inequality hurts economic growth, especially high inequality (like ours) in rich nations (like ours).
Only Mexico and Israel, which have very high inequality, compensate professionals so disproportionately.
Of course, California makes up for high inequality with low incomes.
Even when there is high inequality, they can be changed," Reardon said.
It is how we use the money and change policies that have created high inequality in our society," he said.
For the unit it is places with high inequality, heavy corruption, economic crisis and a collapse in trust.
These include low investment, weak productivity and high inequality, problems that will not be solved by a Brexit.
