I have not read Piketty. But I could imagine a society where the poor are 10% better off and the rich are 1000% better off to be a less stable society that ends up falling apart.

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WalterBright an hour ago | parent [-]

The USSR made everyone equal and it fell apart.

	▲	antiframe 17 minutes ago \| parent [-]
		Citation Needed (that they actually made everyone equal and it wasn't just a talking point). You may want to read a history book that talks about how Stalin denounced uravnilovka and about the existence of the nomenklatura.