1. Core Legal Answer & Context: Anti-dumping provisions under the General Agreement on Tariffs and Trade (GATT) and the World Trade Organization (WTO) aim to address unfair trade practices where products are sold in an export market at a price lower than their 'normal value' in the domestic market of the exporting country. While dumping itself is not prohibited, the imposition of anti-dumping duties is permitted if dumping causes or threatens to cause 'material injury' to a domestic industry in the importing country. The primary legal framework is GATT Article VI and, more comprehensively, the WTO Agreement on Anti-Dumping (ADA).

GATT Article VI: Lays down the basic principles, allowing contracting parties to levy an anti-dumping duty on a dumped product if it causes or threatens material injury to an established domestic industry, or materially retards the establishment of a domestic industry. It sets limits on the duty, stating it should not exceed the margin of dumping.

WTO Agreement on Anti-Dumping (ADA): This agreement elaborates on GATT Article VI, providing detailed rules for the conduct of anti-dumping investigations, the determination of dumping and injury, and the application of anti-dumping measures. It aims to prevent the arbitrary use of anti-dumping measures and ensure they are applied fairly and transparently.

Methods for Determination of "Dumping": Dumping occurs if the export price of a product is less than its 'normal value'.

• Normal Value: This is typically the comparable price, in the ordinary course of trade, for the like product when destined for consumption in the exporting country. If there are no domestic sales, or if they are not in the ordinary course of trade, normal value can be determined by:
  • The comparable price of the like product when exported to an appropriate third country.
  • The 'constructed value', which is the cost of production in the country of origin plus a reasonable amount for administrative, selling, and general costs and for profits.
• Export Price: This is the price at which the product is sold for export to the importing country. If there is no export price or if it is unreliable (e.g., due to an association between the exporter and importer), the export price may be constructed on the basis of the price at which the imported products are first resold to an independent buyer.
• Fair Comparison: A fair comparison must be made between the export price and the normal value, taking into account differences in conditions and terms of sale, taxation, levels of trade, quantities, and physical characteristics, which are also affected by currency conversions.

Methods for Determination of "Material Injury": An anti-dumping duty can only be imposed if the dumped imports cause or threaten material injury to the domestic industry. This involves a two-pronged examination:

• Volume of Dumped Imports: Authorities must consider whether there has been a significant increase in dumped imports, either in absolute terms or relative to production or consumption in the importing country.
• Effect of Dumped Imports on Prices: Authorities must assess whether the dumped imports have significantly undercut the prices of the like product of the domestic industry, or whether their effect is to depress prices to a significant degree or prevent price increases that otherwise would have occurred.
• Impact on the Domestic Industry: This involves an evaluation of all relevant economic factors and indices having a bearing on the state of the domestic industry, including actual and potential decline in sales, profits, output, market share, productivity, return on investments, or utilization of capacity; factors affecting domestic prices; actual and potential negative effects on cash flow, inventories, employment, wages, growth, and the ability to raise capital or investments.
• Causality: A causal link must be established between the dumped imports and the material injury. Injuries caused by other factors (e.g., contraction in demand, technological developments, trade restrictive practices of third countries) must not be attributed to the dumped imports.

2. Relevant Statutes and Sections:

• General Agreement on Tariffs and Trade (GATT) 1994, Article VI.
• Agreement on Implementation of Article VI of the General Agreement on Tariffs and Trade 1994 (the "Anti-Dumping Agreement" or "ADA").

3. Important Landmark Cases:

• US – Anti-Dumping Act of 1916 (DS136/DS162): This WTO dispute settlement case clarified that the ADA provides the exclusive multilateral framework for anti-dumping measures, and domestic laws must conform to it.
• EC – Bed Linen (DS141): This case provided important interpretations on the methodology for calculating dumping margins, particularly concerning 'zeroing' practices.

4. Clear Conclusion: The anti-dumping provisions under GATT and the WTO's ADA provide a detailed and disciplined framework for states to address unfair trade practices. The determination of dumping requires a rigorous comparison of export price and normal value, while material injury assessment demands a comprehensive analysis of import volumes, price effects, and the overall impact on the domestic industry, with a clear causal link established. These stringent requirements aim to ensure that anti-dumping measures are legitimate trade remedies and not disguised protectionism.