Purchasing Power: The Real Value of Money

"It's not what you earn. It's not even what you have. It's what you can buy with what you have — and that changes every year whether you notice or not."

The number in your bank account is a nominal figure. It tells you how many units of currency you own. What it does not tell you is how much those units will actually buy — and that is the only number that matters for your financial well-being.

Understanding purchasing power — and its erosion — is the foundation of understanding why people hold Bitcoin.

Nominal vs. Real Value

Nominal value is the face value of money — the number on the bill or bank statement, unadjusted for inflation.

Real value is the purchasing power of that money — what it can actually buy, adjusted for changes in the price level.

Example:

In 2000, $100,000 was a very good annual salary in most US cities. In 2024, $100,000 is a moderate salary in many cities. The nominal number is identical. The real purchasing power — what that salary actually buys in housing, food, healthcare, education — has declined significantly.

This distinction is not academic. It is the difference between thinking you are becoming wealthier (because your nominal balances grow) and understanding that you may be becoming poorer in real terms (because your balances grow slower than prices).

The Dollar's Purchasing Power Over Time

The US dollar is often cited as the world's reserve currency, the benchmark of financial stability. It is both of those things. It is also a currency that has lost approximately:

These figures are based on CPI calculations — which likely understate real purchasing power loss (see Inflation → for why).

Practical illustration:

The dollar amounts multiplied while the actual items (a house, a year of education, a medical procedure) remain the same. What changed was the purchasing power of each dollar.

The Rule of 70

A useful mental shortcut: divide 70 by the annual inflation rate to estimate how many years it takes for purchasing power to halve.

A 35-year career worked at 2% annual inflation means that by retirement, the dollar has lost approximately 50% of its purchasing power. Everything saved in nominal dollars earns the real return of nominal returns minus inflation.

If your savings earn 3% in a bank account while inflation runs at 4%, you are losing 1% of purchasing power per year — even though your nominal balance grows.

Traditional Inflation Hedges and Their Limitations

People have historically held certain assets as protection against purchasing power erosion:

Real Estate

Real estate has broadly kept pace with inflation over decades in many markets, and significantly outpaced it in supply-constrained cities (New York, San Francisco, London). But:

• Illiquid (cannot sell a fraction of your house)
• Requires maintenance, taxes, insurance
• Local market risk (Detroit home prices collapsed; Reno home prices boomed)
• Requires debt for most buyers, adding leverage risk
• Cannot be moved or held globally

Equities (Stocks)

The S&P 500 has historically returned ~7% real (after inflation) over long periods. But:

• Requires selecting the right index or companies
• Significant volatility (drawdowns of 40–60% in bear markets)
• Counterparty risk (you own a claim, not the business)
• Concentrated in a single economy's performance

Gold

Gold has been a reliable store of purchasing power over centuries. A Roman centurion could buy a fine toga with an ounce of gold; that same ounce buys a fine suit today. But:

• 0% yield (you earn nothing holding gold)
• Storage and insurance costs
• Confiscatable (FDR confiscated private gold in 1933)
• Limited portability globally
• Slow to transfer; easy to counterfeit at scale

Commodities, TIPS (Treasury Inflation-Protected Securities), Farmland

All have roles in inflation protection but share limitations: illiquidity, management requirements, counterparty dependency, or limited portability.

Bitcoin's Purchasing Power Track Record

Bitcoin's record as a store of purchasing power is extraordinary by historical standards — with the important caveat that it is also the most volatile of any major asset.

Comparison starting from different periods:

The Bitcoin number is extraordinary — and also accompanies drawdowns of 50–85% multiple times during that period. A holder who bought in January 2021 and looked at their portfolio in November 2022 saw a 75% nominal decline. A holder who bought in January 2015 and held through every drawdown held one of the best-performing assets in recorded financial history.

The key variable: time horizon. Bitcoin's purchasing power performance is strongest over 4+ year periods and historically weakest over 1–2 year periods. The volatility is real. The long-term trajectory, driven by fixed supply and growing adoption, has consistently been positive.

Measuring Real Returns

Real return = Nominal return − Inflation rate

This applies to every asset:

• Bank savings account earning 4% with 5% inflation = −1% real return
• Bitcoin returning 50% in a year with 5% inflation = +45% real return
• S&P 500 returning −18% (2022) with 9% inflation = −27% real return

Most financial reporting focuses on nominal returns. The real return is what matters for purchasing power preservation.

The time preference dimension: Economics introduces a related concept — time preference. High time preference means preferring present consumption over future savings. Low time preference means being willing to delay consumption for future benefit.

Sound money (with stable or appreciating purchasing power) encourages low time preference — it's worth saving because your savings will retain or gain value. Inflationary fiat money encourages high time preference — save later, spend now before inflation erodes what you've saved.

Bitcoin's deflationary supply schedule (decreasing new issuance over time) structurally rewards low time preference. The fewer new Bitcoin being created and the more adoption grows, the more each existing Bitcoin purchases over time. This inverts the incentive structure of fiat money.

For Further Reading

→ Continue: Inflation Explained → | Bitcoin Price Mindset → | Economics Hub →