The quiet arithmetic
The Federal Reserve aims for inflation of two percent a year, and the long-run American average has run closer to three. That sounds harmless until it compounds. At three percent, prices double in about twenty-four years, and $100 left in a drawer for thirty years comes out buying what $41 buys today.
Real and nominal
The rate printed on a statement is the nominal return. The real return is roughly the nominal rate minus inflation, and it is the only one that tells you whether you are getting ahead. A savings account paying four percent while prices rise three percent earns about one percent in real terms. A checking account paying nothing loses three percent a year. Judge a raise the same way: three percent more pay in a year when prices rose four percent is a one percent cut. The Bureau of Labor Statistics publishes the Consumer Price Index every month, and the twelve-month change is a fair number to bring to a salary conversation.
Match the money to the horizon
- Money you will need within a year or two belongs in an insured savings account with a competitive rate, where its job is to be there and keeping up with prices is a bonus.
- Money for goals three to ten years away can sit in certificates of deposit or Treasury securities, including the inflation-protected kind whose value adjusts with the price index.
- Money you will not touch for decades needs growth, and diversified stock holdings have historically outrun inflation by a wide margin over long periods, with severe drops along the way and no guarantee.
When inflation helps you
Fixed-rate debt gets lighter as prices and wages rise. A thirty-year fixed mortgage payment that takes twenty-eight percent of your income today may take under twenty percent in fifteen years, while a renter's cost climbs the whole time.
Plan in today's dollars
A million dollars forty years from now, at three percent inflation, buys what about $307,000 buys today. To keep long projections honest, run them with a real rate of return, so that every result is already expressed in present purchasing power. Your own inflation rate is also not the national one. Rent, childcare, tuition and medical care have risen faster than the overall index for decades, while electronics and clothing have risen more slowly.
Tip Once a year, reprice every fixed dollar figure in your financial life: the emergency fund target, the insurance coverage limits and the savings goals. Numbers set five years ago are quietly too small.
