Basically flat since WWII, despite significant growth in GDP per capita, and before that it was lower.
The high marginal rates in the mid-20th century were fictional because at the time there were so many loopholes that nobody actually paid them. If you think there are a lot of loopholes now, you have no idea. When the marginal rates were lowered, enough of the loopholes were closed at the same time that if you tried to guess when it happened by looking at that graph, you wouldn't be able to tell.
Also, some of the loopholes are still there, but what does that imply for the theory that lower rates are the relevant change? When Richie Rich (or Microsoft) is claiming no taxable income, 60% of nothing is the same as 20% of nothing.
But if that isn't the change, what is? Well, in 1995 the largest company by market cap was GE at ~$92B. In today's dollars that's ~$197B. The largest company today is $4154B. More than 2000% bigger even adjusted for inflation.
And it's the corporations buying the politicians anyway. Who is paying the money, Larry Page or Google? It's Google. If the company is that big, it doesn't matter if it's owned by one person or a million, the CEO has control of enough resources to buy the government, and then does.
> "Effective Income Tax Rates Have Fallen for The Top One Percent Since World War II"
That link has an agenda. Choosing the height of WWII as the baseline is cherry picking. Effective rates were higher during WWII than they were before or since, but that was eight decades ago, not for very long, and for an obvious reason.
They're also achieving even that much difference by applying speculative math to capital gains, which is meaningless because doing that in real life would result in major behavioral changes.
And it's still not clear how any of that is supposed to solve it. Suppose the founder of MegaCorp has to sell more of their shares to pay the money in tax. They sell them to BlackRock or China or whatever. Is that going to cause MegaCorp's lobbyists to stop trying to capture the government? How? You need there to be more, smaller companies, not change who owns the shares of the predatory megacorps.
It's clear you have very little historical or economic knowledge about taxation, and it seems like the sum total of your thoughts on the matter is: taking money from people I don't like makes me feel good.
