an opportunity to present evidence. Anti-dumping measures must expire five years after the date of imposition, unless a review shows that ending the measure would lead to injury. Generally speaking, an anti-dumping investigation usually develops along the following steps: domestic producers make a request to the relevant authority to initiate an anti-dumping investigation. Then investigation to the foreign producer is conducted to determine if the allegation is valid. It uses questionnaires completed by the interested parties to compare the foreign producer's (or producers') export price to the normal value (the price in the exporter's domestic market, 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). If the foreign producer's export price is lower than the normal price and the investigating body proves a causal link between the alleged dumping and the injury suffered by the domestic industry, it comes to a conclusion that the foreign producer is dumping its products. According to Article VI of GATT, dumping investigations shall, except in special circumstances, be concluded within one year, and in no case more than 18 months after initiation. Anti-dumping measures must expire five years after the date of imposition, unless a review shows that ending the measure would lead to injury. Anti-dumping investigations are to end immediately in cases where the authorities determine that the margin of dumping is, de minimis, or insignificantly small (defined as less than 2% of the export price of the product). Other conditions are also set. For example, the investigations also have to end if the volume of dumped imports is negligible (i.e., if the volume from one country is less than 3% of total imports of that product—although investigations can proceed if several countries, each supplying less than 3% of the imports, together account for 7% or more of total imports). The agreement says member countries must inform the Committee on Anti-Dumping Practices about all preliminary and final anti-dumping actions, promptly and in detail. They must also report on all investigations twice a year. When differences arise, members are encouraged to consult each other. They can also use the WTO's dispute settlement procedure. Actions in the United States In the United States, domestic firms can file an anti-dumping petition under the regulations determined by the U.S. Department of Commerce, which determines "less than fair value" and