I agree with the sentiment here but would be interested to see what portion of US tax revenue is coming from the same people who are benefiting from the discoun

I agree with the sentiment here but would be interested to see what portion of US tax revenue is coming from the same people who are benefiting from the discounted rate for investment earnings. Basically, is the "subsidy" essentially coming from the beneficiaries and ultimately just undermining the progressive tax structure rather than the poor paying to subsidize lower tax rates for the investments of the rich.