Economics
Real Interest Rate
Quick fact
When inflation is higher than the nominal interest rate, the real interest rate becomes negative – meaning savers effectively lose purchasing power even as their nominal balance grows.
Why this is interesting
You see a savings account offering 5% interest – looks great, right? But what if everything you buy costs 6% more by next year? Suddenly, you're actually losing money. Why does this happen?
Read the full explanation
Understanding Real Interest Rate
Imagine you lend a friend $100 today, and they promise to pay back $105 in one year. That's a 5% nominal return. But if prices rise by 3% over the year (inflation), your $105 will only buy what $102 would have bought today. Your real gain is just 2%. The real interest rate strips away the illusion of inflation to show true growth in purchasing power. It's calculated simply as: Real Rate ≈ Nominal Rate – Inflation Rate. This 'Fisher equation' gives you the honest picture of whether your money is actually working for you.
A deeper explanation
The real interest rate matters because economic decisions depend on real, not nominal, incentives. Borrowers care about the real cost of loans – if inflation is high, borrowing becomes cheaper in real terms because the money repaid is worth less. Lenders and savers care about real returns to preserve or grow wealth. Central banks set policy rates aiming to influence real rates to manage economic growth and inflation. The ex ante real rate (expected inflation) drives investment and consumption decisions, while ex post real rate (actual inflation) shows historical outcomes. Understanding real rates clarifies why high inflation can devastate savings and why low rates stimulate borrowing.