Dumping is said to have taken place when an exporter sells a product to India at a price less than the Normal value of like articles sold in the domestic market of the exporter. However, imports at cheap or low prices do not indicate dumping. Then normal value is the comparable price at which the goods under complaint, is sold in the ordinary course of trade in the domestic market of the exporting country.
The purpose of anti-dumping duty is to rectify the trend of distortive effects of dumping and reestablish fair trade and this is permitted by WTO.
When the export price from a country is lower than the Normal value, it constitutes dumping and as such export price and the Normal value are 2 fundamental parameters used for determination of dumping.
Conceptually anti-dumping and the like measures are linked to the notion of fair trade. As against this, custom duties are a means of raising revenue which fall the realm of trade and fiscal policies of the Govt. Anti dumping duties are levied against specific exporting countries whereas custom duties are universally applicable.
The domestic producers expressly supporting the anti-dumping application must account for not less than 25% of the total production of the like article by the domestic industry.
Source : Steelguru