Wojciech Kopczuk

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Although better education, particularly at the primary and secondary levels, would be a great thing in America, I don’t really believe that such an improvement would reverse wealth inequality in the country, as Thomas Piketty has suggested. We seem to be in a spiral with no easy answers. From the Economist:

“AMONG the most controversial of Thomas Piketty’s arguments in his bestselling analysis of inequality, Capital in the Twenty-First Century is that wealth is increasingly concentrated in the hands of the very rich. Rising wealth inequality could presage the return of an 18th century inheritance society, in which marrying an heir is a surer route to riches than starting a company. Critics question the premise: Chris Giles, the economics editor of the Financial Times, argued earlier this year that Mr Piketty’s data were both thin and faulty. Yet a new paper suggests that, in America at least, inequality in wealth is approaching record levels.

Earlier studies of American wealth have tended to show only small increases in inequality in recent decades. A 2004 study of estate-tax data by Wojciech Kopczuk of Columbia University and Emmanuel Saez of the University of California, Berkeley, found an almost imperceptible rise in the share of wealth held by the top 1% of families, from about 19% in 1976 to 21% in 2000. A more recent investigation of the Federal Reserve’s data on consumer finances, by Edward Wolff of New York University showed a continued but gentle increase in inequality into the 2000s. Mr Piketty’s book, which drew on this previous work, showed similarly modest rises in wealth inequality in America.

A new paper by Mr Saez and Gabriel Zucman of the London School of Economics reckons past estimates badly underestimated the share of wealth belonging to the very rich. It uses a richer variety of sources than prior studies, including detailed data on personal income taxes (which the authors mine for figures on capital income) and property tax, which they check against Fed data on aggregate wealth. The authors note that not every potential source of error can be accounted for; tax avoidance strategies, for instance, could cause either an overestimation of the wealth share of the rich (if they classify labour income as capital income in order to take advantage of lower rates) or an underestimation (if they intentionally seek out lower yielding investments for their tax advantages). Yet they believe their estimates represent an improvement over past attempts.

The results are enough to make Mr Piketty blush.”

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