In Which I semi defend Alan Reynolds' article in the Washington Times from Brad DeLong
Reynolds writes
...Thomas Piketty and Emmanuel Saez, ... half of that increase happened in just two years, 1987 and 1988. ... Increases in the top 1 percent's income after the 1986 Tax Reform came from more business income being reported on individual tax returns, rather than corporate tax returns. The share of the top 1 percent income coming from business profits jumped from 11 percent in 1986 to 21 percent in 1988, ... How and why that happened is a textbook example of why tax return data cannot be used to measure income distribution...
Brad writes
29% of 17% is 5% as the tax-return-estimate based share of business income reported by the top one-hundredth. If the tax law were different today, a good chunk of that 5% would be reported as capital income, and a smaller chunk as labor income. The estimates the people I talk to come up with is that the 1986 Tax Reform boosted the long-run measured share of the top one-hundredth relative to the true share by between 0 and 2 percentage points, leaving between 7 and 9 percentage points as the true underlying increase in the income share of the top one-hundredth.
I write