Dumping

The sale of a commodity in a foreign market at less than fair value.
Dumping is generally recognized as unfair because the practice can disrupt
markets and injure producers of competitive products in an importing
country. Article VI of the GATT permits imposition of antidumping duties
equal to the difference between the price sought in the importing country
and the normal value of the product in the exporting country.

With price-to-price dumping, the foreign producer can use its sales in the
high-priced market (usually the home market) to subsidize its sales in the
low-priced export market. The price difference is often due to protection
in the high-priced market.

Price-cost dumping indicates that the foreign supplier has a special
advantage. Sustained sales below cost are normally possible only if the
sales are somehow subsidized.