Materials and other supplies held for use in the production of inventories are not written down below cost if
the finished products in which they will be incorporated are expected to be sold at or above cost. However,
when a decline in the price of materials indicates that the cost of the finished products exceeds net realisable
value, the materials are written down to net realisable value. In such circumstances, the replacement cost of
the materials may be the best available measure of their net realisable value