Larry Summers says:
The rich have advantages that money cannot buy, by Lawrence Summers: ... There is every reason to believe that taxes can be reformed to eliminate loopholes for the wealthy and become more progressive, while also promoting a more efficient allocation of investment. In areas ranging from local zoning laws to intellectual property protection, from financial regulation to energy subsidies, public policy now bestows great fortunes on those whose primary skill is working the political system rather than producing great products and services. There is a compelling case for policy measures to reduce profits from such rent-seeking activities as a number of economists, notably Dean Baker and the late Mancur Olson, have emphasised.
At the same time, unless one regards envy as a virtue, the primary reason for concern about inequality is that lower- and middle-income workers have too little – not that the rich have too much.
So in judging policies relating to inequality, the criterion should be what their impact will be on the middle class and the poor. ...
It is vital to remember, however, that important aspects of inequality are unlikely to be transformed just by limited income redistribution. Consider two fundamental components of life – health and the ability to provide opportunity for children.
He goes on to explain the vast difference between the rich and the poor in the areas of health and education, and I have no problem at all with his call to reduce inequality in these areas.
The question I have is whether we should not be worried "that the rich have too much." As he notes earlier, "public policy now bestows great fortunes on those whose primary skill is working the political system rather than producing great products and services." Those "great fortunes" give the ultra-wealthy the influence they need to capture the political system, and as the fortunes grow larger and larger it becomes harder and harder to change the system to eliminate this rent-seeking behavior (so I don't think "there is every reason to believe" that the system can be reformed). When this happens, when income flows to the top because they have captured the system -- income that could (and in my view should) be going elsewhere -- I think it's worth asking if they have "too much."