How haute is too haute? The French government’s official position is that the new tax rate of 75% on incomes over one million euros is not likely to stymie growth or cause an exodus of the productive. Why, according to “Thomas Piketty and Emmanuel Saez, two French economists who influenced Mr. Hollande, . . . growth won’t be hurt unless the marginal rates on the highest incomes exceed 83 percent.” So see, 75% is a little on the low side — they’re just giving the fatcats (les chats gros?) an extra 8% take home. Where’s the gratitude?