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Concept
Mark-to-market accounting
Résumé
Mark-to-market (MTM or M2M) or fair value accounting is accounting for the "fair value" of an asset or liability based on the current market price, or the price for similar assets and liabilities, or based on another objectively assessed "fair" value. Fair value accounting has been a part of Generally Accepted Accounting Principles (GAAP) in the United States since the early 1990s. Failure to use it is viewed as the cause of the Orange County Bankruptcy, even though its use is considered to be one of the reasons for the Enron scandal and the eventual bankruptcy of the company, as well as the closure of the accounting firm Arthur Andersen.
Mark-to-market accounting can change values on the balance sheet as market conditions change. In contrast, historical cost accounting, based on the past transactions, is simpler, more stable, and easier to perform, but does not represent current market value. It summarizes past transactions instead. Mark-to-market accounting can become volatile if market prices fluctuate greatly or change unpredictably. Buyers and sellers may claim a number of specific instances when this is the case, including inability to value the future income and expenses both accurately and collectively, often due to unreliable information, or over-optimistic or over-pessimistic expectations of cash flow and earnings.
In the 1800s in the U.S., marking to market was the usual practice of bookkeepers. This has been blamed for contributing to the frequent recessions up to the Great Depression and for the collapse of banks. The Securities and Exchange Commission told President Franklin Roosevelt that he should get rid of it, which he did in 1938. But in the 1980s the practice spread to major banks and corporations, and beginning in the 1990s mark-to-market accounting began to result in scandals.
To understand the original practice, consider that a futures trader, when beginning an account (or "position"), deposits money, termed a "margin", with the exchange. This is intended to protect the exchange against loss.
Source officielle
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