Start with the thing that is actually measured
Before reserve currencies, there is a simpler and better-documented question: what does a dollar buy? The Bureau of Labor Statistics publishes the Consumer Price Index, and the erosion of purchasing power over decades is not in dispute. That is a measurement, not an opinion.
Its limits belong with it. CPI tracks one basket, methodology has changed over time, and the inflation an individual household experiences depends on what it buys — housing, tuition and medical care have behaved differently from consumer goods. The chart tells you what a dollar bought. It does not tell you what any asset will do next.

Describe this illustration: Chart showing the decline in what one U.S. dollar buys across recent decadesHide description: Chart showing the decline in what one U.S. dollar buys across recent decades
A descending line showing the real purchasing power of one dollar over successive decades, derived from the Consumer Price Index published by the U.S. Bureau of Labor Statistics. The measurement is well documented. Its limits belong with it: CPI is one basket, methodology has changed over time, and individual households experience different inflation. The chart says what a dollar bought — not what any investment will do next.




