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In accounting and economics, fair value is a rational and unbiased estimate of the potential market price of a good, service, or asset. It takes into account such objective factors as: * acquisition/production/distribution costs, replacement costs, or costs of close substitutes * actual utility at a given level of development of social productive capability * supply vs. demand and subjective factors such as * risk characteristics * cost of and return on capital * individually perceived utility In accounting, fair value is used as a certainty of the market value of an asset (or liability) for which a market price cannot be determined (usually because there is no established market for the asset). Under US GAAP (FAS 157), fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. This is used for assets whose carrying value is based on mark-to-market valuations; for assets carried at historical cost, the fair value of the asset is not used. One example of where fair value is an issue is a college kitchen with a cost of $2 million which was built five years ago. If the owners wanted to put a fair value measurement on the kitchen it would be a subjective estimate because there is no active market for such items or items similar to this one. In another example, if ABC Corporation purchased a two-acre tract of land in 1980 for $1 million, then a historical-cost financial statement would still record the land at $1 million on ABC’s balance sheet. If XYZ purchased a similar two-acre tract of land in 2005 for $2 million, then XYZ would report an asset of $2 million on its balance sheet. Even if the two pieces of land were virtually identical, ABC would report an asset with one-half the value of XYZ’s land; historical cost is unable to identify that the two items are similar. This problem is compounded when numerous assets and liabilities are reported at historical cost, leading to a balance sheet that may be greatly undervalued. If, however, ABC and XYZ reported financial information using fair-value accounting, then both would report an asset of $2 million. The fair-value balance sheet provides information for investors who are interested in the current value of assets and liabilities, not the historical cost. == Fair value vs market price == There are two schools of thought about the relation between the market price and fair value in any kind of market, but especially with regard to tradable assets: * The efficient-market hypothesis asserts that, in a well organized, reasonably transparent market, the market price is generally equal to or close to the fair value, as investors react quickly to incorporate new information about relative scarcity, utility, or potential returns in their bids; see also Rational pricing. * Behavioral finance asserts that the market price often diverges from fair value because of various, common cognitive biases among buyers or sellers. However, even proponents of behavioral finance generally acknowledge that behavioral anomalies that may cause such a divergence often do so in ways that are unpredictable, chaotic, or otherwise difficult to capture in a sustainably profitable trading strategy, especially when accounting for transaction costs. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fair value」の詳細全文を読む スポンサード リンク
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