John Whiting, tax policy director at the UK's Chartered Institute of Taxation commented "There clearly are some significant amounts hidden away, but if it really is that size what is being done with it all?" and "If the suggestion is that such amounts are actively hidden and never accessed, that seems odd - not least in terms of what the tax authorities are doing. In fact, the US, UK and German authorities are doing a lot", and noting that if the figures were accurate "you would expect the havens to be more conspicuously wealthy than they are". However, he also admitted that "I cannot disprove the figures at all, but they do seem staggering" «Tax havens: Super-rich 'hiding' at least $21tn». BBC News. 22 de julio de 2012. Consultado el 3 de octubre de 2012.
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Kopczuk, Saez, and Song find that "most of the increase in the variance of (log) annual earnings is due to increases in the variance of (log) permanent earnings with modest increases in the variance of transitory (log) earnings." Thus, in fact, the increase in earnings inequality is in lifetime income. Furthermore, they find that it remains difficult for men to move up the earnings distribution, while women fare better). Kopczuk, Wojciech (2010). «Earnings Inequality and Mobility in the United States: Evidence from Social Security Data since 1937 *». Quarterly Journal of Economics125 (1): 91-128. doi:10.1162/qjec.2010.125.1.91.
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