Virtually all of the data cited by the left to decry the supposed explosion of income inequality, as Lee Ohanian and Kip Hagopian point out in their seminal paper, "The Mismeasure of Inequality" (Policy Review, 2011), use a Census Bureau definition of "money income" that excludes taxes, transfer payments like Medicaid, Medicare, nutrition assistance, the Earned Income Tax Credit, and even costly employee benefits such as health insurance.
Thus the data that is conventionally used to calculate the so-called Gini coefficient—the most commonly used measure of income inequality—ignore America's highly progressive income tax system and the panoply of benefits and transfer payments. According to Messrs. Ohanian and Hagopian, once the effect of taxes and transfer payments is taken into account, "inequality actually declined 1.8% during the 16-year period between 1993 and 2009, when the Gini coefficient dropped from .395 to .388."
http://online.wsj.com/news/articles/SB10001424052702303773704579269990020773098
"Seek and you shall find." Unless what you seek is a reason why inequality of income or wealth matters. I have yet to find even a bare bones explanation that goes beyond voodoo and chicken bones for rationale.
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