The given statement where they paid interest on their credit card bill describes a demander
Any market's price is defined by the money given to suppliers and the money spent by consumers. In terms of the financial exchanges, those who supply capital by saving expect to receive a level of interest, whereas individuals who demand capital by receiving money expect to pay a rate of return. The form that this return on investment takes will vary depending on the type of investment.
A person who uses a credit card and puts money into a checking account is acting as both a capital supply and a demander at the same time.
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