Yield Purchasing Power: $100M Today Matches $100K in 1979

I wrote a story about poor Clarence who retired in 1979, and even poorer Larry who retired last year. I created these characters to challenge the notion of calculating a real interest rate by subtracting inflation. The idea is that the decline of a currency can be measured by the rate of price increases. This price-centric view leads to the concept of purchasing power—the amount of stuff that a dollar can buy. It’s the flip side of prices. When prices rise, purchasing power falls.