There is no controversy that the Laffer curve exists. The argument is where the curve peaks. Laffer oversimplified the curve to demonstrate his concept and later admitted that the curve peaked much further up the scale than he first postulated.
In the 1950s and 60s when top tax brackets topped off at 95% millionaires did not sit down and say f*ckit...They continued to make money and pay the taxes.
The lie of the Laffer curve is that they would quit at a much much lower percentile.
It is a fantasy.
Exactly.
Rich people make money two different ways:
The first is investment profit. Anytime someone has excess money, they are naturally going to seek a rent or profit on that money. They will do this REGARDLESS of what the tax rate is because being able to keep a percent of one's profit is ALWAYS preferable to keeping all of zero profit.
The other way is from their work, whatever that may be. They enjoy doing what they do, otherwise, since they are rich and thus by definition don't have a financial need to work, they wouldn't do it. Since they don't work soley for income, we can only assume that most of them would continue working, regardless of what the tax rate is. Even for the few that decided to no longer work, they are easily replaceable, and them leaving their jobs would simply allow some other smart/tallented/hard working person the opportunity to "get rich".
There is little downside to increasing the tax rate on the rich, other than the possiblity that these people may flee the country with their wealth inorder to avoid US taxation, but even that is moderated by the fact that basically every country that has a high standard of living has taxes that are comparable or higher than taxation in the US.
But there is a HUGE upside to decreasing taxes on the worker/consumer class, in that doing so would increase demand, resulting in business expansion, more business profits, more jobs, higher wages, less poverty, more wealth creation, and a lower level of dependency on the government.