There are ways around this. You could minimize the accounting by setting a rebate level, then issuing a check to everyone (yes, even the rich people) for that

There are ways around this. You could minimize the accounting by setting a rebate level, then issuing a check to everyone (yes, even the rich people) for that amount. To use your numbers, if you issued a rebate check for $100/month to everyone, the poor person would pay an effective rate of zero, while the rich person would still pay an effective rate of $400/month.