1. In applying Article 3, the Customs administration shall, wherever possible, use a sale of similar goods at the same commercial level and in substantially the same quantities as the goods being valued.  Where no such sale is found, a sale of similar goods that takes place under any one of the following three conditions may be used:

1. A sale at the same commercial level but in different quantities;
2. A sale at a different commercial level but in substantially the same quantities; or
3. a sale at a different commercial level and in different quantities.
   
   

1. Having found a sale under any one of these three conditions adjustments will then be made, as the case may be, for:

1. quantity factors only;
2. commercial level factors  only; or
3. both commercial level and quantity factors.

1. The expression “and/or” allows the flexibility to use the sales and make the necessary adjustments in any one of the three conditions described above.

1. For the purpose of Article 3, the transaction value of similar imported goods means a Customs value, adjusted as provided for in paragraphs 1 (b) and 2, which has already been accepted under Article 1.
• A condition for adjustment because of different commercial levels or different quantities is that such adjustment, whether it leads to an increase or a decrease in the value, be made only on the basis of demonstrated evidence that clearly establishes the reasonableness and accuracy of the adjustment, e.g. valid price lists containing process referring to different levels or different quantities.  As an example of this, if the imported goods being valued consist of a shipment of 10 units and the only similar imported goods for which a transaction value exists involved a sale of 500 nits, and t is recognizes that the seller grants quantity discounts, the require adjustment may be accomplished by resorting to the seller’s price list and using that price applicable to a sale of 10 units.  The does not require that a sale had to have been made in quantities of 10 as long as the price list has been established as being bona fide through sales at other quantities.  In the absence of such an objective measure, however, the determination of a Custom value under the provisions of article 3 is not appropriate