Looks like Lawrence Summers is saying the same things I have been saying about inequality. He's even echoing the realization that the Right opines for aristocracy as he correctly notes in the title of the piece. His conclusion is excellent.
It is ironic that those who profess the most enthusiasm for market forces are least enthusiastic about curbing tax benefits for the wealthy. Sooner or later inequality will have to be addressed. Much better that it be done by letting free markets operate and then working to improve the result. Policies that aim instead to thwart market forces rarely work, and usually fall victim to the law of unintended consequences.