Inflation
The rate at which the general level of prices for goods and services rises [verify: long-term US inflation rate benchmark], eroding the purchasing power of uninvested currency.
Systems Engineering Analogy
A silent memory leak in cash: an ongoing loss that diminishes real purchasing power over time.
Mathematical SpecificationDeterministic
Real Return = (1 + nominal) / (1 + inflation) - 1Variables:
nominal (r):Stated gross annual percentage return
inflation (i):Annual price index inflation rate eroding purchasing power
Worked Example Scenario
With inflation [verify: historical rate, source BLS], holding uninvested cash steadily diminishes real purchasing power.
Featured in: Book 06: The Silent Leak
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