Final answer:
In the financial market for credit cards, the equilibrium occurs at an interest rate of 15% where the quantity of funds demanded and supplied are equal at an equilibrium quantity of $600 billion.
Step-by-step explanation:
In the financial market for credit cards, the equilibrium occurs at an interest rate of 15% where the quantity of funds demanded and supplied are equal at an equilibrium quantity of $600 billion.
At an above-equilibrium interest rate like 21%, the quantity supplied would increase to $750 billion, but the quantity demanded would decrease to $480 billion.
At a below-equilibrium interest rate like 13%, the quantity demanded would increase to $700 billion, but the quantity supplied would decrease to $510 billion.