An upward or downward adjustment of the value of an asset for accounting and reporting purposes. These adjustments are estimates and tend to be subjective; although they are usually based on events affecting the investee company or its securities beneficially or detrimentally. A write-up is a boost made to the book value of an asset as the current carrying value is lower than fair market value. A write-down is the opposite, as it reduces the book value of an asset when its FMV has fallen below than the known carrying book value and is now considered an impaired asset.

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