Valuation Principles
Conceptually, intermediate goods or services should be valued at purchaser's market prices (including transaction costs and tax), at the point in time when the good or service enters the process of production, not when they were acquired by the producer.
In practice, the two times will coincide for inputs of services, but often not for goods, because these can be bought and stored some time as inventories, before they are actually used in production.
Read more about this topic: Intermediate Consumption
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