Money and purchasing power

Commodity Money vs Fiat Currency: Value and Purchasing Power

Money is a means of payment, a unit for comparing prices and a store of value. Commodity money and fiat money can perform those functions, but they derive their monetary value through different arrangements. [1]

By The Golden Dow · Last updated October 14, 2026 · Editorial policy

Commodity money and redeemable notes

Commodity money is made from something that has value beyond its monetary use, such as gold. A note redeemable for gold or silver is different: the note is a claim to the underlying commodity rather than the commodity itself. The European Central Bank's overview describes this progression while distinguishing it from modern fiat currency. [1]

The classical gold standard tied currencies to fixed amounts of gold. Its reserve and redemption rules constrained monetary policy, but they did not fix all goods prices. Gold inflows, outflows and central-bank decisions still affected the system. [2]

What makes fiat money usable?

Fiat currency is not directly redeemable into a specified commodity. The ECB explains the euro as legal tender that is widely accepted, with central banks working to preserve its value. The fact that a banknote's paper has little material value does not mean the currency has no economic function or that inflation must inevitably become hyperinflation. [1]

Money can also exist electronically. The ECB distinguishes central-bank money from commercial-bank deposits, which make up much of the money people use. A digital form does not by itself turn fiat money into commodity money: physical form and redemption rules are separate questions. [1]

A commodity ratio is not consumer-price inflation

The Golden Dow divides an asset's dollar price by a commodity benchmark's dollar price. If an illustrative asset costs $100 and gold costs $2,000 per troy ounce, the ratio is 0.05 ounces. If the asset stays at $100 and gold rises to $2,500, the ratio falls to 0.04 ounces even though the asset's dollar price has not changed. These are hypothetical figures illustrating our calculation, not historical observations. [3]

Consumer-price inflation concerns the cost of a basket of goods and services. A stock-to-gold or stock-to-oil ratio instead compares two market-price series. It can be useful for understanding relative performance, but calling it a complete measure of “real wealth” or saying it removes inflation entirely overstates what the calculation does. [3]

Limits of purchasing-power comparisons

Commodity prices change with their own supply, demand and market conditions. Futures benchmarks are not necessarily the price a household pays to buy or store physical goods. Asset-price ratios also do not automatically include dividends, transaction costs or delivery expenses. Neither monetary history nor a ratio chart supplies a recommendation to buy gold, stocks or another asset. See the full methodology and limitations. [3]