Comparative Taxes, France Edition

Emmanuel Saez and Thomas Piketty are justly famous in America for their striking work on income inequality in America that incontrovertibly shows the immense gains that have gone to the upper echelons of American society the previous 35 years.  Well, Piketty is a French economist, and it turns out that he is also worried about the income distribution in France.  Apparently, the French tax code becomes regressive for the upper 3% or so, and Piketty, with his co-authors, lays out a plan to make those French taxpayers pay more than those earning less them.  The book is called Pour une revolution fiscale (Amazon) See the image below the fold for the problem that drives Piketty et. al.