Only if output prices of the non-domestic market (No 312) are not available, then this variable may be approximated by the unit value index (No 313).
Variable 313: Unit value index
The unit value index may be used as an approximation for non-domestic output prices.
For the purpose of this index, unit values are calculated as the value of sales of a product divided by the quantity sold derived from foreign trade data. This unit value is then treated as the average price of the product and the index calculated in the same way as for the traditional output price indices.
