Well, this can be tricky. One has to exclude first the possibility that the reason of the shift in the tax burden was not caused by the shift of wealth. The maharajas always will pay more taxes than the poorest peasants for a simple reason that poorest are not able to support the state apparatus.
I would rather see how much tax burden is located on the top 1%, top 5% and top 50% of wealth. If one percent of the U.S. population owns sixty percent of the stock and forty percent of the total wealth "bearing 25 percent of the federal tax burden" maybe is TOO LITTLE! Do not forget also that such tax like Social Security is regressive (and being used to pay for other budget items including those subsidising lucrative government contracts).
Your position seems to supported by nothing more than Marxist class warfare. The best tax system is one that maximizes tax revenue while minimizing taxes as a percentage of GDP.
I would rather see how much tax burden is located on the top 1%, top 5% and top 50% of wealth.
Your wish is my command. Heres the income tax burden changed by President Reagan:
Top Tax Top Top From Lowest
Rate 1% 5% 51-95% 50%
1981 70% 17.89% 35.36% 57.22% 7.42%
1987 38.5% 24.81% 43.26% 50.67% 6.07%
As you can see by lowering the highest marginal rate from 70 to 38.5% President Reagan shifted the tax burden more on the richest segment of society. While this is counterintuitive, its not when you consider how people react when having most of their earnings confiscated by the government. People will shift their activities from high taxed activities to low taxed activities (such as leisure). So by lowering the highest marginal tax rate the rich paid more in taxes.