Dalton Conleysays that "it is now the rich [in the US] who are the most stressed out and the most likely to be working the most." Here's one of the reasons:
... [It] turns out that the growing disparity is really between the middle and the top. If we divided the American population in half, we would find that those in the lower half have been pretty stable over the last few decades in terms of their incomes relative to one another. However, the top half has been stretching out like taffy. In fact, as we move up the ladder the rungs get spaced farther and farther apart.
The result of this high and rising inequality is what I call an “economic red shift.” Like the shift in the light spectrum caused by the galaxies rushing away, those Americans who are in the top half of the income distribution experience a sensation that, while they may be pulling away from the bottom half, they are also being left further and further behind by those just above them.
And since inequality rises exponentially the higher you climb the economic ladder, the better off you are in absolute terms, the more relatively deprived you may feel. In fact, a poll of New Yorkers found that those who earned more than $200,000 a year were the most likely of any income group to agree that “seeing other people with money” makes them feel poor.