Economics
Nominal vs. Real Interest Rates
Quick fact
If a bond pays 10% nominal interest and inflation is 8%, the real interest rate is only about 2%—meaning the lender's purchasing power grows very slowly.
Why this is interesting
You see a bank offering 5% interest on savings—seems like a good deal, right? But if inflation is running at 6%, are you actually gaining or losing money?
Read the full explanation
Understanding Nominal vs. Real Interest Rates
Interest rates are usually quoted as nominal rates—the simple percentage you see on a loan or savings account. But inflation eats into the actual value of money over time. The real interest rate strips out inflation to show the true change in purchasing power. Think of it this way: if you earn 5% on your savings but prices rise by 3%, your buying power only grows by about 2%. The nominal rate is the headline; the real rate is the bottom-line effect on what you can actually buy.
A deeper explanation
The relationship is captured by the Fisher equation: real interest rate ≈ nominal interest rate – inflation. This isn't just arithmetic—it reflects the core trade-off between present and future consumption. Central banks target real rates to influence economic activity. Investors use real rates to compare returns across different inflationary environments. When inflation is high, nominal rates often rise to compensate, but if inflation expectations shift, real rates can become negative, effectively taxing savers and subsidizing borrowers. Understanding this distinction prevents illusionary gains and reveals the genuine cost of borrowing.