The Hidden Wealth of Nations: The Scourge of Tax Havens is a 2013 book by French economist Gabriel Zucman, which popularized the concept of both the tax haven and corporate tax haven. The French publication was translated into English by Teresa Lavender Fagan. The foreword was written by Thomas Piketty, Zucman's PhD supervisor. Both Piketty and Zucman are critical of capitalism in its present form. Where Piketty's best-selling Capital in the Twenty-First Century was the catalyst for debate about inequality, Zucman targets individual and corporate tax havens. According to Zucman's research, $USD7.6 trillion representing about eight percent of global net financial wealth, is held in offshore accounts where no taxes are collected.