What is the difference between nominal and real interest rates?

Nominal interest rates and real interest rates are two different measures used in economics and finance to assess the cost of borrowing or the return on investment. The key difference between the two lies in the consideration of inflation.

1. Nominal Interest Rate:
Nominal interest rate refers to the stated or nominal rate of interest on a financial instrument, such as a bond, loan, or deposit account. It is the rate that is quoted or advertised by financial institutions. The nominal interest rate does not account for inflation and reflects the actual interest earned or paid on an investment or loan.

For example, if you have a fixed deposit with a nominal interest rate of 5% per year, you will receive 5% interest on your principal each year. However, the purchasing power of that interest may erode if inflation is higher than 5%.

2. Real Interest Rate:
Real interest rate takes into account the impact of inflation on the purchasing power of money. It is the nominal interest rate adjusted for inflation, providing a more accurate representation of the true return on investment or the actual cost of borrowing.

The formula to calculate the real interest rate is:
Real Interest Rate = Nominal Interest Rate Inflation Rate

A positive real interest rate means that the return on investment or the cost of borrowing is higher than the inflation rate, resulting in a net increase in purchasing power. Conversely, a negative real interest rate indicates that the return on investment is lower than the inflation rate, resulting in a decrease in purchasing power.

For example, if the nominal interest rate on your fixed deposit is 5%, and the inflation rate is 3%, the real interest rate would be 2% (5% 3%). This means your investment is growing by 2% in terms of purchasing power after accounting for inflation.

Understanding the difference between nominal and real interest rates is crucial for making informed financial decisions. Real interest rates provide a more accurate picture of the actual returns or costs associated with financial instruments, considering the impact of inflation on the value of money over time.