Nominal vs. Real Interest Rates
The nominal interest rate is the stated rate you see on bank accounts, bonds, and loan agreements. The real interest rate subtracts inflation, revealing the true change in purchasing power. The Fisher equation approximates this as: real rate = nominal rate minus inflation rate. A savings account paying 2% nominal interest during 3% inflation delivers a real rate of -1%, meaning your purchasing power is actually declining.
When Real Rates Go Negative
Negative real interest rates mean that savers are losing purchasing power even while earning nominal interest. This has been the reality in many developed economies for extended periods. When central banks hold rates near zero while inflation runs at 2-4%, the real rate is deeply negative. In this environment, holding cash or low-yield deposits is not safe; it is a guaranteed loss of purchasing power. This is the hidden tax of inflation that many savers fail to recognize.
Investment Implications
Negative real rates push rational investors toward assets that can outpace inflation: equities, real estate, and inflation-linked bonds. When real rates turn positive, bonds become more attractive on a risk-adjusted basis. Always evaluate investment returns in real terms. A 7% nominal return sounds impressive, but if inflation is 5%, the real return is only 2%. Long-term financial planning should be built entirely on real return assumptions to avoid overestimating future purchasing power.