The government doesn't need to handle capitol allocation. We can simply shift the tax burden upwards. Poorer people get reduced tax, rich people get more.
I think the US has pretty good revenue structure in that regard. In my country 62% of federal budget comes from sales taxes (e.g. 23% VAT), which disproportionately affects poor people.
[1] https://www.stlouisfed.org/on-the-economy/2017/january/feder...
I would be somewhat surprised (rather flabbergasted) if rich folks paid anywhere close to the percentage that poor people do.
In other words: if you want to compare by measuring contribution, measure tax rate to what's left for that individual's personal use.
This already happens. Many people either don't pay tax, or pay less tax than they cost.
> The government doesn't need to handle capitol allocation.
Then who will spend the tax money?
In other words: we don't need to invent taxing people with more money more. We have that. Millions of people are partly or fully paid for by others. We might want to adjust it, but we don't need to pretend we're doing something revolutionary in doing so.