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Why do car rental companies prefer/require credit over debit cards?
People with credit cards tend to have better credit than those who only have debit cards. People with better credit tend to not abuse such things as car rentals. It costs money for any company to run your credit. It doesn't cost a rental company any outflow of money to reject debit cards. So the possession of a credit card becomes a stand-in for running your credit before you rent a car.