Economics
Money Interest Rates
Quick fact
Central banks like the Federal Reserve adjust a key interest rate to influence the entire economy—lowering it can stimulate borrowing and growth, while raising it helps cool down inflation.
Why this is interesting
You've seen interest rates mentioned in the news, but have you ever wondered why they change and how they affect your everyday life, from your savings account to your mortgage?
Read the full explanation
Understanding Money Interest Rates
An interest rate is simply the price you pay to borrow money, usually expressed as a yearly percentage. For example, borrowing $100 at a 5% annual interest rate means you owe $105 after one year. This cost compensates lenders for risk and the lost opportunity to use that money elsewhere. Central banks set a 'policy rate' that banks charge each other for short-term loans, and this rate ripples through the economy: it influences the rates banks offer on mortgages, car loans, and credit cards. When rates are low, borrowing is cheaper, so people and businesses spend more, boosting the economy. When rates are high, borrowing becomes expensive, which slows spending and helps control inflation.
A deeper explanation
The mechanism behind interest rates rests on the time value of money and the interplay of supply and demand for credit. Money today is worth more than the same amount in the future because it can be invested to earn returns. Interest rates represent this premium for delaying consumption. Central banks manage the money supply to achieve stable prices and full employment: they lower the policy rate to encourage lending and economic activity or raise it to prevent overheating. The real interest rate—nominal rate minus inflation—indicates the true cost of borrowing. Changes in the policy rate alter the cost of funds for commercial banks, which then adjust their rates for loans and deposits, transmitting monetary policy throughout the economy. Understanding this mechanism reveals why interest rates are a powerful tool for influencing economic cycles.