The growing inequality and concentration of wealth is due to differences in individuals with respect to ambition, intelligence, prudence, willingness to take risk, and ability to delay gratification. No other explanation required.
That having been said there is no intrinsic problem with wealth inequality. The leftwingers always ignore that industry creates more wealth, it doesn't just reorganize a static quantity that becomes maldistributed.
The basic fundamental underlying premises of these tiresome statists are false. This latest entry is a mere rehash of the same old same old...