This is assuming we have accurate income numbers from back then.
Strangely enough there was a period in which the tax code was brutal to high personal income--during which personal income was a lot lower than either before or after. This was a period where there were a lot of legal tax avoidance schemes and little ability to detect tax evasion by the rich.
Why do I think the income numbers weren't accurate during that period?
Do you think that there is less tax avoidance now than there was in 1975?
One simple example: Look at the crash in commercial real estate prices in the 80s. That came about because it had been driven up way above it's true market value because of it's use in tax avoidance.
The run up in real estate values is also caused by the income inequality. When given an increase in income the already rich are more inclined to save the increase rather than spend it on consumption. They buy Treasury bills and other bonds, they put it into the stock market, they buy oil and gas leases, they buy paintings, old cars, antiques, etc., and they buy commercial real estate, largely through REITs.. This all in an effort to produce a return on these investments. This produces inflation in these areas, the stock market goes up, interest rates go down, and the price of commercial real estate goes up.
The very cornerstone of your supply-side economics is that the already rich are more likely to "invest" any income increase. But they are by and large savings, not economy building investments that provide jobs. And savings are money that is withdrawn from the economy.
We have covered this ground before, you and I. You actually were reduced to saying that the savings in banks got out into the economy somehow, you just couldn't tell me how this happens.
Certainly, income tax avoidance due to the capital gains scam is higher today than in 1975. Tieing CEO bonuses to the corporation's stock price and thereby encouraging them to convert corporate income into higher stock prices by buying their own stock was unheard of in 1975.
While it is bad for the economy it has nothing to do with tax avoidance.
I am sorry but you are wrong. It has everything to do with tax avoidance, it converts profits into capital gains. If the profits are distributed as dividends they are taxed in the year that they are received as personal income. When the profits are used to buy back the corporations stock the stock price increases and the increase is considered to be capital gains which is paid only when and if the stock is sold, at the reduced tax rate for capital gains, usually half of the rate at the top for personal income.
It is telling that you didn't know this. There is much more of this single tax avoidance and tax delay than there was in 1975. Voiding your point completely.
Do you agree that there is a much worse income and wealth inequality today than there was in 1975?
I'm saying we don't have the data one way or the other, and the problem is far more complex than simply tax policy anyway.
But we do have good data for incomes today and in 1975. Every year on April 15 we pay our taxes by reporting our incomes.
You are bordering on what I consider the most ridiculous argument for supply side economics, that if we lower their taxes the already rich are less likely to cheat on their taxes or to take advantage of the many illegal tax avoidance schemes. It is if the otherwise firm and steadfast capitalists were denying in this single instance the driving force behind capitalism, greed.
You would expect inequality to go up with the computer revolution. It made highly skilled people far more productive because they waste far less time on low-skill parts of their job. Taxing that away would be very unfair.
Also, even at the bottom the standard of living has risen, just not as fast as it did at the top.
Yes, the average real wage for the majority of the non-rich has gone up by 8% in the forty years of neoliberalism defining our economic policies. This is for the bottom 50%, 1980 to pre-COVID-19 depression. It is certain that this modest gain has been completely wiped out in the depression made worse than it had to be by the incompetence of conservative governance.
And yes, it is much more complicated than just tax policies. We changed our economic policies starting in the 1970s. This argument that the economy is now somehow naturally, almost magically decided to reward the skilled rather than the unskilled completely ignores this fact.
Essay question: Do you believe that the changes in our economic policies had no effect on the income distribution in the US?
I seriously doubt that. In fact, I believe that the main purpose of these changes was to tilt the income distribution to favor the already rich at the costs of everyone else.
There are very few jobs that don't require some skills. Your argument that as much as 50% of the workforce is unskilled demeans these workers. Just another reason that so many feel alienated today and lash out by doing often contradictory and harmful things, like voting for Trump.