The inconvenience of carrying $40 for cab fare is not worth anywhere near 2.9% of my income, yet if all of a cabbie's customers pay by credit, that's a minimum

The inconvenience of carrying $40 for cab fare is not worth anywhere near 2.9% of my income, yet if all of a cabbie's customers pay by credit, that's a minimum of 2.9% of his income excluding chargeback fraud.