are all assets marked to market 
marking to market is the standard for the financial industry it is used primarily to value financial assets and liabilities which fluctuate in value the accounting thus reflects both their gains and their losses in value other major industries such as retailers and manufacturers have most of their value in long term assets known as property plant and equipment ppe as well as assets like inventory and accounts receivable not all of these assets will recoup 100 of their value they are recorded at historic cost and then impaired as circumstances indicate correcting for a loss of value for these assets is called impairment rather than marking to market 