In The Wall Street Journal Phil Gramm and Michael Solon write How to Distort Income Inequality- The Piketty-Saez data ignore changes in tax law and fail to count noncash compensation and Social Security benefits.


An equally extraordinary distortion in the data used to measure inequality (the Gini Coefficient) has been discovered by Cornell’s Mr. Burkhauser. In 1992 the Census Bureau changed the Current Population Survey to collect more in-depth data on high-income individuals. This change in survey technique alone, causing a one-time upward shift in the measured income of high-income individuals, is the source of almost 30% of the total growth of inequality in the U.S. since 1979.

Simple statistical errors in the data account for roughly one third of what is now claimed to be a “frightening” increase in income inequality. But the weakness of the case for redistribution does not end there. America is the freest and most dynamic society in history, and freedom and equality of outcome have never coexisted anywhere at any time. Here the innovator, the first mover, the talented and the persistent win out—producing large income inequality. The prizes are unequal because in our system consumers reward people for the value they add. Some can and do add extraordinary value, others can’t or don’t.

How exactly are we poorer because Bill Gates Warren Buffett and the Walton family are so rich? Mr. Gates became rich by mainstreaming computer power into our lives and in the process made us better off. Mr. Buffett’s genius improves the efficiency of capital allocation and the whole economy benefits. Wal-Mart stretches our buying power and raises the living standards of millions of Americans, especially low-income earners. Rich people don’t “take” a large share of national income, they “bring” it. The beauty of our system is that everybody benefits from the value they bring.

Yes, income is 24% less equally distributed here than in the average of the other 34 member countries of the OECD. But OECD figures show that U.S. per capita GDP is 42% higher, household wealth is 210% higher and median disposable income is 42% higher. How many Americans would give up 42% of their income to see the rich get less?

Vast new fortunes were earned in the 25-year boom that began under Reagan and continued under Clinton. But the income of middle-class Americans rose significantly. These incomes have fallen during the Obama presidency, and not because the rich have gotten richer. They’ve fallen because bad federal policies have yielded the weakest recovery in the postwar history of America.

Yet even as the recovery continues to disappoint, the president increasingly turns to the politics of envy by demanding that the rich pay their “fair share.” The politics of envy may work here as it has worked so often in Latin America and Europe, but the economics of envy is failing in America as it has failed everywhere else.