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Are Credit Cards a service to banks?
Credit cards are a golden goose for banks, as they get to issue high-interest loans and simultaneously generate alot of fee income. Debit cards aren't quite as good, but they still generate substantial fee income -- ~2% of every credit/non-PIN debit transaction goes to the bank and credit card network. Credit histories exist because they are the most effective tool available to predict whether you will pay back your loans or not. You don't need a credit history to buy most things, you need a credit history to get a large loan. Think of it from perspective of a lender: Credit scoring is the bank's way screening out people who are expensive to do business with. It's objective, doesn't discriminate on the basis of race, sex or other factors, and you have recourse if the rating agencies have incorrect information.