Keywords: Tariffs, Most Favored Nation, Non-tarrif proteccions, Sector promotion progras, imports, exportation, trade, duties, countervailing duties, trade, liberalization, anti-dumping, tariff structures, domestic market, Foreing trade commission, World Trade Organization, WTO, taxes, most-favored-nation (MFN), preferencial tariffs, Mexico´s General import and export tariff law, quotas, import permits, dumping, Mexico´s Foreing Trade Commission, Foreing trade, trade, preferential, Non-tariff protections, imports, exports, import, Free trade Agreemnent, North American Free Trade Agreement, Nafta, Countervailing duties, domestic market, Foreing Trade Commission