Résumé en anglais

For a number of decades now, at the instigation of Anglo-Saxon standard setters, the basis of the traditional accounting model, or the financial conventions which determine how a company’s wealth and income is measured, have been increasingly called into question. This wide-reaching movement, initiated in the United States by the Financial Accounting Standards Board (FASB), and internationally by the International Accounting Standards Committee (IASC), aims to replace historical cost - the current basis for the measurement of a company’s income statement and valuation of its assets and liabilities - with the notion of fair value. The concept of fair value is broader and can be applied more generally than that of market value : indeed, where there is no quoted market price available on an active market, the valuation is determined by the exchange value agreed by two independent parties, by the market price of an item with similar characteristics or by the net present value estimate of future cash flows. Fair value can potentially be used for a large number of non financial assets and liabilities and can therefore serve as the basis for a new corporate accounting model which aims to provide a more accurate reflection of the uncertainties affecting future cash flow estimates and investment opportunities in financial reports. This article looks at the usefulness of measuring a company’s wealth and net income using the fair value method. In this regard, the key question – is fair value relevant? – can be analysed as follows: do fair value “accounting numbers” provide a better estimate of the value of a company and the risk relating to its activity? How informative are they for users? How useful is fair value information for decision-making?