I'm sorry, I'm not entertaining anyone who pushes trickle down trite at this point. It's so far beyond the point of pretending such claims are actually in good faith it's not even funny.
Somehow in the 1950s we had marginal tax rates on top earners that were like over 75%. And when the folks who talk about "making America great again" are asked what period of time they'd like to go back to they're usually thinking the 1950s.
It has a tiny bit of merit on the basis that limited wealth inequality creates opportunities for investment of the surplus capital in novel ways. Something that doesn't work well in planned economies with forced equality. What we have today with a small number of plutocrats hoarding all the wealth doesn't work because they're playing a game of exclusively enriching themselves with no incentive to trickle anything down.
There is a big space in between today's world and Harrison Bergeron. Somewhere in that space is probably the global optimum. False dichotomies are false.
Of course you are not hoping they will do out of their good of their hearts.
They would naturally want to enrich themselves, and one way to do that is launch new business and employ people, which in turn leads to the transferring back of the wealth to the people. In this manner, this also boosts economy in ways that a simple tax hike would not.