Dumping is defined, basically, as the sale of goods to an export market at a price below that charged for comparable goods in the exporter's home market. The General Agreement on Tariffs and Trade (GATT) does not forbid such action, not even when injurious to the competing domestic industry. However, it has taken the view that dumping constitutes an unfair trade practice. Under GATT, Article VI Contracting Parties (or Members, as they are now termed in the GATT 1994 Agreements) are authorized, as an exception to other GATT obligations, to unilaterally impose antidumping (hereinafter: AD) duties to counteract the effects of dumping. The duties should create a level playing field in which producers all over the world will be able to compete fairly with each other. The principles sound simple and straightforward, yet their application is one of the most contentious topics in international trade law.
The economic coherence of AD rules is controversial. In international trade, price discrimination between national markets is typically made possible when the exporter has a powerful position in the home market and re-exportation to that market is not feasible. In the domestic arena price discrimination is countered by the laws of competition and antitrust. International trade law offers states a very different remedy, that first and foremost protects the competing local industry, regardless of the procompetitive or anticompetitive effects of dumping on the market as a whole.