Unlike FIFO and LIFO, which are cost flow assumptions, FISH is simply a reference to the physical presence of old, unsold items in inventory.
If the same items have been sitting in inventory for years, there are potential accounting issues. For example, the value of the items may be less than their costs due to obsolescence or deterioration. In addition, the company continues to incur other costs of holding inventory such as the cost of capital, space, insurance, etc.
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