A credit card is a payment card issued to users (cardholders) to enable the cardholder to pay a merchant for goods and services based on the cardholder's promise to the card issuer to pay them for the amounts so paid plus the other agreed charges.[1] The card issuer (usually a bank) creates a revolving account and grants a line of credit to the cardholder, from which the cardholder can borrow money for payment to a merchant or as a cash advance. In other words, credit cards combine payment services with extensions of credit.[2] Complex fee structures in the credit card industry may limit customers' ability to comparison shop, helping to ensure that the industry is not price-competitive and helping to maximize industry profits. Due to concerns about this, many legislatures have regulated credit card fees.[3]