Nominal value, real value, and price: the differences

Monetary figures can look comparable while describing different things. Nominal value states an amount in currency units. Real value adjusts that amount for prices. Price is the amount required to acquire something under a specific transaction or reference.

Separating these ideas prevents misleading conclusions about wages, savings, currencies, and historical comparisons.

What is nominal value?

A nominal amount is stated in the current monetary unit without an inflation adjustment.

A salary of 2,000 euros, a debt of 50,000 pesos, or a 100-dollar banknote are nominal values. They show how many currency units appear in a contract, account, or payment instrument.

A banknote's face value is also nominal. A note marked 1,000 continues to show 1,000 even when the amount of products it buys changes.

What is real value?

Real value measures an amount after adjustment for price changes. It answers a different question: how much purchasing power does the amount represent?

If a person receives 5% more pay while prices rise by 8%, nominal pay rises and real pay falls.

The same applies to savings. A balance can stay unchanged in nominal terms while losing purchasing power. It can also rise and still lose real value if its return is lower than inflation.

What is a price?

A price is the amount of a unit of account required to obtain a good, service, asset, or currency.

Different types of price include:

A seller's advertised price.
A final price after taxes and fees.
A market transaction price.
A reference price calculated as an average.
An exchange rate, which is the price of one currency in another.
An implied price derived from a package containing several units.

Two pages can show different numbers without either being wrong when they use different price definitions.

An example over time

Assume a game cost 20 units in the starting year and 30 units ten years later.

In nominal terms, the price increased by 50%. Determining whether it became more expensive in real terms requires a comparison with general inflation.

If the overall price level also rose by 50%, the game costs about the same relative to the average basket. If cumulative inflation was 20%, the game became more expensive in real terms. If inflation was 80%, the game became cheaper in real terms even though its label shows a larger number.

Nominal and real interest rates

The distinction also applies to interest rates.

The nominal rate is the percentage stated for a loan or deposit. The real rate accounts for inflation.

An approximation is:

real rate ≈ nominal rate − inflation

A deposit that pays 4% during a year with 6% inflation increases the nominal balance but reduces purchasing power by about 2%. The exact formula differs slightly because the rates compound.

Face value, cost, and use value

Several figures can coexist for fictional currencies.

A Monopoly banknote has a face value within the game. The physical banknote set also has a production cost and a sale price as part of a product. None of those values is necessarily exchangeable for goods outside the game.

A virtual currency can have a purchase price in dollars, a nominal balance in an account, and a use value limited to specified digital items. If official resale is unavailable, the purchase price does not create a resale price.

Which value does Cartonindex use?

Each comparison uses an observable and reproducible reference. Depending on the object, the reference can be:

Official package price.
Sale price of a complete product.
Nominal amount included in that product.
Exchange rate from a specified source.
Per-unit calculation derived from those inputs.

The result is a comparison value. It does not state that the two elements are economically equivalent in every respect.

Each page must therefore explain which price it uses, what the price includes, its currency, the observation date, and the limits of the conversion.