Fair Value accounting is an accounting term that requires a company to place a value on all of the assets on its balance sheet that, it is the price at which the assets could be sold. This is easy to do when the asset has a quoted market price. However, it is often the case that there is no liquid market for an asset, and thus the company has to make an estimate of fair value. When the marketplace is in turmoil and illiquid, as it has been for much of 2008, companies are sometimes forced to place a very low value on an asset, resulting in a substantial markdown from the prior value. See related links for complete explanations.