However, the top tax rate reductions appear to be associated with the increasing concentration of income at the top of the income distribution.
This is an absurd conclusion. It's like saying the butterfly that flapped its wings in New Guinea is associated with the hurricane in Florida.
The evidence does not suggest necessarily a relationship between tax policy with regard to the top tax rates and the size of the economic pie, but there may be a relationship to how the economic pie is sliced.
That's better. Phew... I almost accused this guy of being partisan.
Research has shown that changes in capital gains and dividends were the largest contributor to the increase in income inequality since the mid-1990s.35 Capital gains and dividends have become a larger share of total income over the past decade and a half while earnings have become a smaller share.36 This suggests that labor’s share of income could also be related to the top tax rates.37 Figure 9 displays this relationship. The fitted values show that the labor share of income is higher
with higher top marginal tax rates and higher top capital gains tax rates. This relationship is statistically significant (see Table A-2).
This is something that I've often wondered about. It's very interesting, but again there are so many more factors than taxes.
What I don't understand is this:
The results of the analysis suggest that changes over the past 65 years in the top marginal tax rate and the top capital gains tax rate do not appear correlated with economic growth. The reduction in the top tax rates appears to be uncorrelated with saving, investment, and productivity growth. The top tax rates appear to have little or no relation to the size of the economic pie.
However, the top tax rate reductions appear to be associated with the increasing concentration of income at the top of the income distribution. As measured by IRS data, the share of income accruing to the top 0.1% of U.S. families increased from 4.2% in 1945 to 12.3% by 2007 before falling to 9.2% due to the 2007-2009 recession. At the same time, the average tax rate paid by the top 0.1% fell from over 50% in 1945 to about 25% in 2009. Tax policy could have a relation to how the economic pie is sliced—lower top tax rates may be associated with greater income disparities.
On the one hand he says that top tax rates have little to no relation to the size of the economic pie. On the other hand he says that tax policy could have a relation to how the economic pie is sliced. How can he make these conclusions when the evidence he uses suggests that both are true?