Debit or credit?

Empirical consumer payment price sensitivity has implications for theory, optimal regulation of payment card networks, and business strategy. A critical margin is the price of a credit card charge. A revolver who did not pay her most recent balance in full pays interest; other credit card users do not. I find that revolvers are substantially less likely to incur credit card charges and substantially more likely to use a debit card, conditional on several proxies for transaction demand and tastes. Debit use also increases with credit limit constraints and decreases with credit card possession. Additional results suggest that debit is becoming a stronger substitute for credit over time.