The cost of inventories may not be recoverable if those inventories are damaged, if
they have become wholly or partially obsolete, or if their selling prices have declined.
The cost of inventories may also not be recoverable if the estimated costs of
completion or the estimated costs to be incurred to make the sale have increased. The
practice of writing inventories down below cost to net realisable value is consistent
with the view that assets should not be carried in excess of amounts expected to be
realised from their sale or use.