Earlier quoted context omitted.
This is basically the same theory as trickle down economics. I thought Harvard wouldn't be pushing that any more.
There is no actual theory of trickle down economics. This is a derogatory term used as a distraction from discussing real economics.
This: https://en.wikipedia.org/wiki/Laffer_curve
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The assertion that the peak of this curve is skewed towards the left (low tax rates), rather than the right (high rates)?
That is, that if the "job creators" don't keep enough of the margin on goods produced, they will just get pissed off, take their marbles and go home, rather than actually bothering to hire a few more people to grab additional marginal income?
The way the Laffer Curve was usually presented, was to give one the impression that there were marginal tax rates so high that they were somehow greater than 100% and ate into income earned at a lower marginal rate, which would otherwise have been retained had there been less of it.
Thus, "trickle down" being the idea that when the rich have more money, they will for some reason voluntarily use it to hire people to produce products and services, regardless of whether or not there is any actual demand, or anticipated demand, for them.
Yes, a marginal tax rate of 110% would be bad. Good thing we don't do that :-) (I guess I should be ready for some example from 1880 where combined locality through federal taxes did for some specific dollar amount - but hopefully such freaky exceptions don't really exist, or at least often enough to matter)
Edit: I realize that the Laffer Curve was primarily about tax revenues, BUT, a large component of the theory was that as the activity increased to generate the tax revenues, it was due to somebody doing the work that created the additional earnings.