How do interest rates affect supply and demand?
Mia Phillips
Updated on February 08, 2026
Interest rate levels are a factor of the supply and demand of credit: an increase in the demand for money or credit will raise interest rates, while a decrease in the demand for credit will decrease them. An increase in the amount of money made available to borrowers increases the supply of credit.
How does lowering interest rates increase money supply?
The Fed can also alter the money supply by changing short-term interest rates. Lower rates increase the money supply and boost economic activity; however, decreases in interest rates fuel inflation, and so the Fed must be careful not to lower interest rates too much for too long.
What happens when interest rates increase in an economy?
When interest rates are rising, both businesses and consumers will cut back on spending. This will cause earnings to fall and stock prices to drop. As interest rates move up, the cost of borrowing becomes more expensive. This means that demand for lower-yield bonds will drop, causing their price to drop.
What do people buy when interest rates are low?
Ways to take advantage of low interest rates include refinancing loans, selling bonds, and buying property. CDs, corporate bonds, and REITs offer the best investment income options when interest rates are low. Visit Business Insider’s Investing Reference library for more stories.
What happens to price level when interest rates decrease?
A low interest rate increases the demand for investment as the cost of investment falls with the interest rate. Thus, a drop in the price level decreases the interest rate, which increases the demand for investment and thereby increases aggregate demand.
How does the supply of money affect the interest rate?
Changes in the Supply of Money When the Federal Reserve adjusts the supply of money in an economy, the nominal interest rate changes as a result. When the Fed increases the money supply, there is a surplus of money at the prevailing interest rate. To get players in the economy to be willing to hold the extra money, the interest rate must decrease.
What happens when the Fed decreases the money supply?
When the Fed decreases the money supply, there is a shortage of money at the prevailing interest rate. Therefore, the interest rate must increase to dissuade some people from holding money. This is shown on the right-hand side of the diagram above.
Why are lower interest rates bad for the economy?
Because the lower interest rate is a false indicator of more available capital, investments will be made in projects that are doomed to failure as the new money works its way through the economy. Eventually, prices in general will rise in response to the new money.
How are money supply and demand and nominal interest rates determined?
Nominal Interest Rates and the Market for Money. Like many economic variables in a reasonably free-market economy, interest rates are determined by the forces of supply and demand. Specifically, nominal interest rates , which is the monetary return on saving, is determined by the supply and demand of money in an economy.