The cab driver is a really bad example because the cab driver isn't providing a service that people argue is a human right. In terms of healthcare I think that it's reasonable that those who can should pay more to cover for those who can only afford to be grateful. That is usually how the cost of public services is distributed using taxes.
If you read my post again I am sure that you will understand that the predicament of my wife is irrelevant to my argument. Economically rationally the taxi driver will charge according to the perceived value of his service, which in terms of money means more to a rich person. Of course other factors weigh into this equation, especially competition and the fact that people aren't economically rational.
Should the can driver charge you outrageously because you are richer than he is?
Only if you are outrageously rich and the driver did an excellent job of emergency transportation and only by billing you after the fact. The first priority should be on saving lives, then sort the logistics out later.
