Sorry, no soup for you.Quote from Cache Landing:
A Treasury study done at the request of the Joint Economic Committee of Congress traced the income reported by 14,351 taxpayers between 1979 and 1988. One result is that 85.8% of those who started in the bottom quintile in 1979 had climbed to a higher quintile by 1988. In fact more of them were in the top quintile in 1988 than were still in the bottom quintile.
After WWI the top income tax bracket was a high 73%. But the Revenue Acts lowered it to 25% in a set of reductions starting in 1921 and completed in 1926. This was done because it was argued that high taxes were restricting economic growth. Tax revenue surged during the 1920's from $719 million in 1921 to $1.16 billion in 1928, an increase of over 61%.
There is no escaping the fact that when the taxation of large incomes is excessive, they tend to disappear. In 1916 there were 206 incomes of $1,000,000 or more. Then the high rate went into effect. The next year there were only 141, and in 1918, but 67. In 1919, the number declined to 65. In 1920 it fell to 33, and in 1921 it was further reduced to 21.
http://www.bigissueground.com/politics/blair-trickledownreagan.shtml
The story of the guys in the bar above proves the point nicely.
In your first paragraph, you refer to the Reagan years. Try not to forget that the apparent prosperity was met with what was at that time unheard of budget deficits adding significantly to the national debt. Looking at only one side of the equation, the shiny part, is hardly a full and objective analysis. Only the Bushes were able to surpass Reagan's deficit spending.
You then go on and refer to the post WWI economic boom and attribute it solely to tax cuts? That's a tad glib, wouldn't you say? And it's interesting that your reference should only lead up to, but not include, the popping of the bubble in 1929.
In your third paragraph, you refer to the prosperity of 1916, followed by a decline shortly thereafter. You are aware, of course, that Wilson called for war on Germany, which the U.S. Congress declared on 6 April 1917. The United States had a small army, but it drafted four million men and by summer 1918 was sending 10,000 fresh soldiers to France every day. You think that might have been a factor at all?
I must concede that you chose your periods under review most carefully.

What else you got?
But point well taken.