> For instance, I point out in my book (Piketty 2014a, ch. 8–9) that the rise of top income shares in the United States over the 1980–2010 period is due for the most part to rising inequality of labor earnings,

Rognlie(2014) points out fatal errors in Piketty's primary analysis of wealth inequality. In summary:

“ Recent trends in both capital wealth and income are driven almost entirely by housing, with underlying mechanisms quite different from those emphasized in Capital. ” http://mattrognlie.com/piketty_diminishing_returns.pdf