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In economics, the unit of account is a unit of measurement. The quality that it measures is market value.

Goods for sale in a market are priced using a unit of account. In this manner the value is measured by the seller and expressed to the buyer .

Contracts of credit or debt are denominated in a unit of account. In this manner the agreed value of the debt is measured, and the method of settling the debt is defined.

Whilst all market participants are free to use any unit of account that they prefer, most markets have only a few widely accepted units of account. For example in Japan the most universal unit of account is the yen.

Historically the unit of account function has been served by one of the following:

Some examples from historyHistory is often used as a generic term for information about the past, such as in "geologic history of the Earth". When used as the name of a field of study, history refers to the study and interpretation of the record of human societies. The term histor include:

It is generally assumed that a good unit of account is one that is stable. Just as a measuring stick used to measure length should itself be stable in length so to a unit of account used to measure value should itself be stable in value. However there are schools of economic thought that challenge this view point.

While it is most common to think of accounts in currency, it is possible to hold accounts in gold (as e-gold does) or options in various other commodities.

Value is ultimately a subjective quality so the value that a unit of account measures is in practice a market value. The point at which multiple subjective view points converge for the purposes of a free exchange of goods.

Inflation and deflation are the rise and fall, respectively, in the value of the unit of account.



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