Unit of Account

In economics, a unit of account is the common measuring stick used to express prices, record debts, and compare the relative worth of unlike goods and services. Instead of pricing a car in bushels of wheat and a haircut in chickens, an economy standardizes on one denomination, historically a national currency such as the dollar or euro, so every transaction, invoice, and balance sheet entry can be expressed in the same terms.

For an asset to work well as a unit of account, its value needs to stay reasonably stable over the timeframes people actually use for pricing and bookkeeping. This is where most cryptocurrencies struggle. Bitcoin can swing by double-digit percentages within a single day, so pricing goods directly in BTC is impractical: an item priced at a fixed satoshi amount in the morning could be significantly under- or overpriced by the afternoon. A small number of merchants quote prices in Bitcoin, but most crypto-native businesses instead peg invoices to a fiat value and simply accept the equivalent amount of crypto at the time of payment.

Stablecoins address this gap directly. By pegging their value to the US dollar or another fiat currency, they let users price NFTs, DeFi loans, and on-chain services in a stable denomination without leaving the blockchain, effectively borrowing fiat's unit-of-account stability while keeping settlement on-chain. Some protocols have also experimented with algorithmic or basket-pegged units for internal accounting, though none has matched the acceptance of fiat currencies.

Until crypto volatility falls sharply, cryptocurrencies are likely to remain far more useful as a store of value and medium of exchange than as a genuine unit of account.