down the range of possible options. It provides three methods to calculate a product's "normal value". The main one is based on the price in the exporter's domestic market. When this cannot be used, two alternatives are available—the price charged by the exporter in another country, or a calculation based on the combination of the exporter's production costs, other expenses and normal profit margins. And the agreement also specifies how a fair comparison can be made between the export price and what would be a normal price. Five-percent rule According to footnote 2 of the Anti-Dumping Agreement, domestic sales of the like product are sufficient to base normal value on if they account for 5 percent or more of the sales of the product under consideration to the importing country market. This is often called the five-percent or home-market-viability test. This test is applied globally by comparing the quantity sold of a like product on the domestic market with the quantity sold to the importing market. Normal value cannot be based on the price in the exporter's domestic market when there are no domestic sales. For example, if the products are only sold on the foreign market, the normal value will have to be determined on another basis. Additionally, some products may be sold on both markets but the quantity sold on the domestic market may be small compared to quantity sold on foreign market. This situation happens often in countries with small domestic markets like Hong Kong and Singapore, though similar circumstances may also happen in larger markets. This is because of differences in factors like consumer taste and maintenance. Calculating the extent of dumping on a product is not enough. Anti-dumping measures can only be applied if the act of dumping is hurting the industry in the importing country. Therefore, a detailed investigation must first be conducted according to specified rules. The investigation must evaluate all relevant economic factors that have a bearing on the state of the industry in question; if it is revealed that dumping is taking place and hurting domestic industry, the exporting company can raise its price to an agreed level in order to avoid anti-dumping import duties. Procedures in investigation and litigation Detailed procedures are set out on how anti-dumping cases are to be initiated, how the investigations are to be conducted, and the conditions for ensuring that all interested parties are given