Consumption of fixed capital is defined in the 1993 SNA in general terms as the decline, during the course of the accounting period, in the current value of the stock of fixed assets owned and used by a producer as a result of physical deterioration, normal obsolescence or normal accidental damage. This decline is expressed in the average prices of the period, but the 1993 SNA does not give guidance about whether the prices to be used should relate to the general price level or whether they should be asset specific.