In the United States, the share of total pre-tax income accruing to the top 1% has more than doubled from less than 10% in the 1970s to over 20% today (CBO 2011 and Piketty and Saez 2003). A similar pattern is true of other English-speaking countries. Contrary to the widely held view, however, globalisation and new technologies are not to blame. Other OECD countries such as those in continental Europe or Japan have seen far less concentration of income among the mega rich (World Top Incomes Database 2011).
Income Inequality: Why An 80 Percent Top Tax Rate Could Fix It