But, the rates of taxation are so arbitrary. Legislators get together to determine fixed rates and tiers of taxation.
Aside from the complexities of accounting (which should be simpler with computers), couldn't it make more sense to tie tax rates to real mean wages? Then, the very rich would have incentive to increase jobs and increase mean wages.
How would that work in practice?
Actually, it only means that with that taxation system, the concentration of wealth was slower than without that taxation system.
Regarding the wealth "naturally flowing towards the already rich", define "naturally".
Why, what problem do you have with Democracy, err, I mean this tax-rate?
Of course, this sort of thing would never happen in a "True Democracy". Maybe they have it in Scotland, run by the Scots, perhaps?
Ostensibly, representatives and senators decided to modify the tax code in this way. Unfortunately, the commercial entities that wanted it really didn't give them a choice in the matter - so it was no decision at all (reduce them: get re-elected; don't reduce them: don't get re-elected).
It all comes down to who holds the purse strings ... on campaigns.