http://www.nytimes.com/2016/09/13/opinion/a-global-tax-on-wealth.html 2016-09-12 22:08:32 A Global Tax on Wealth A reader writes that such a tax “would expose the amount of wealth hidden in tax havens and introduce real tax transparency.” === To the Editor: Re “ Thomas Piketty, in his best-selling book, “Capitalism in the Twenty-First Century Taxpayers of the world, unite! Demand that your governments endorse such a universal global tax. JOYCE APPLEBY Taos, N.M. The writer is emerita professor of American history at the University of California, Los Angeles.