The discussion of negative interest rates usually begins when the overall economy isn't performing well, or a country is in a recession. Some people believe that if interest rates drop below zero, it will stimulate growth and improve the economy. To better understand the concept of negative interest rates, however, it helps to comprehend the difference between nominal interest rates and real interest rates.
Nominal Interest Rates
A nominal interest rate is the rate stated on borrower's note or investment agreement. Negative nominal interest rates may seem impossible because no one would want to invest or lend money with a promise of receiving less back than their initial investment. However, nominal negative interest rates could occur if, for example, the currency being held is somehow lost, stolen or destroyed.
Real Interest Rates
Real interest rates are simply nominal interest rates minus the rate of inflation. Real interest rates reflect the actual cost of the loan to the borrower and the actual yield or return to the lender. Negative real interest rates would occur if, for example, the nominal rate on a bond was 3 percent, and the rate of inflation was 4 percent, making the real interest rate on the bond -1 percent.
An Uncommon Practice
Both negative nominal interest rates and negative real interest rates are extremely rare. However, two cases of negative real interest rates have occurred in the last 45 years. In 1998, Japanese banks paid banks in the Western world to hold money for them during their economic crisis, and in the 1970s, the same situation occurred when banks in Switzerland charged customers to hold their money instead of paying interest.