Inflation Adjuster
Nominal cost vs. real purchasing power β two lines, one story.
the rule of 72 and why central banks fear 8% 🖖
Divide 72 by the inflation rate to approximate how many years it takes for purchasing power to halve. At 2% it takes ~36 years β manageable. At 8% it takes ~9 years β a working career sees money halve twice. This is why central banks target ~2%: high enough to avoid deflation, low enough that wage growth can outpace it. The nominal value line rising above your fixed amount isn't profit β it's the price tag going up.
Why the same money buys less 🖖
Inflation is compound interest run in reverse: each year the same coins buy a little less, and the shortfalls stack up like interest. The nominal line climbs because it multiplies by (1+Ο)βΏ; the real line falls because it divides by the same factor β one story told from two directions. Keep β¬1000 as cash at 3% inflation for 20 years and it still reads β¬1000, yet buys only what β¬554 buys today.
When prices doubled every 15 hours 🖖
This tool caps inflation at 50% a year, but reality has blown far past that. In Hungary in 1946 prices doubled roughly every 15 hours β the worst hyperinflation ever recorded β and the highest-denomination banknote ever issued reached 10Β²β° pengΕ. At those speeds the halving time of purchasing power is measured in hours, not years, and the printing presses literally cannot keep pace.
Example problems
- moderate inflation - Moderate inflation over a decade erodes purchasing power materially.
- high inflation - High inflation rapidly changes nominal and real value comparisons.
- long-run - Long-run compounding inflation strongly impacts real purchasing power.