A tariff is a tax payable on cross-border goods traffic from one customs territory to another. We normally refer to the term “import tariff” for this type of activity, which occurs most frequently. Rates are divided into two categories. Specific tariffs are imposed as a fixed tariff for each unit of imported good; and ad valorim duties, imposed at a rate proportional to the value of an imported good. While the primary purpose of tariffs is to protect both the domestic industry and the jobs it generates; The government also benefits because the tariff increases tax revenue. However, nothing is zero-sum economically responsible, as domestic producers gain because the tariff protects them from foreign competitors by increasing the cost of foreign goods; but consumers lose because they have to pay more for certain imports. A subsidy is government financial assistance for a product sold on the market. Usually defined as the differential on the retail price, to make the trade of the product more competitive. Subsidies take many forms, including cash donations, low-interest loans, tax breaks, and government equity ownership in domestic companies. When applied to the domestic product and to reduce costs (supply-applied subsidies), subsidies help farmers in two ways: they help them compete with low-cost foreign imports and they help them gain export market. The biggest gains are subsidies for domestic products, whose international competitiveness increases as a result. A quota is a direct restriction on the amount of a good that can be trafficked to and from a country. The restriction is usually enforced by issuing trade licenses or certificates to a group of individuals or companies. This permitted volume of trade is particularly advantageous...... middle of paper ......anti-dumping processes take place between a state and a private individual, never between states. Private individuals carry out landfills and state checks. Making this fact judicial in nature, it is necessary to follow certain steps in the dumping investigation process, which are covered by the WTO. Administrative trade policies are bureaucratic regulations designed to limit import levels. Applied to products in their prices (annual statistics, customs assessments, traffic rights, ringtones, etc.), in its essence (packaging, registrations, labeling, formulations, etc.) or in volume (antitrust policies, consumption, market share , etc.). They are the most feared commercial policy instruments, since they lack measurable, quantifiable or debatable criteria in a multilateral context, they are specific to each State and are measured according to their own criteria pre-established and consolidated in their own culture.