Inflation Adjuster

Nominal cost vs. real purchasing power β€” two lines, one story.

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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€)ⁿ; the real line falls because it divides by the same factor β€” one story told from two directions. Keep €1000 as cash at 3% inflation for 20 years and it still reads €1000, yet buys only what €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 10²⁰ 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.