And we honestly do know with 100% certainty all else equal
50% corporate tax rates will result in higher prices than 0% corporate tax rates.
Those Reagan, Bush and Trump tax cuts for the rich that resulted in 60% of all filers paying $0.
The only tax cuts for the wealthy have given us is the most progressive tax code maybe ever with the US wealthy paying a higher percentage of the whole than any other first world nation on earth.
The "progressive" tax code is a farce, and a laughable one at that. It punishes professionals who are high wage earners, while allowing the investor class effectively a free pass. The parts of the economy that have seen the largest gains are usually those that are able to take advantage of tax offsets, such as up until recently the various Real Estate sectors. Deferring capital gains via borrowing against assets which have appreciated is something that should not be allowed and you can defer such gains in Real Estate via swaps so long as you reinvest the total value of a sale in a new property.
All income should be taxed basically the same with very few exceptions (such as government bonds used for infrastructure, not baseball parks like currently). And if Corporations are considered "legal" individuals we should tax them exactly like any other "legal" individual is taxed.