antidumpingduties canada commerce commercialpolicy congresses cottontrade discrimination disputeresolution(law) duty-freeimportation econometricmodels economicassistance economicintegration europeaneconomiccommunitycountries europeanunioncountries foreigneconomicrelations foreigntraderegulation freetrade generalagreementontariffsandtrade(organization) importquotas internationalcooperation internationaltrade interstatecommerce latinamerica lawandlegislation mathematicalmodels notification(internationalrelations) physicaldistributionofgoods producetrade protectionism provinces rulesandpractice rulesandpracticeworldtradeorganization statisticalmethods subsidies tariff tariffpreferences tokyoround(1973-1979) traderegulation transparencyingovernment unitedstates uruguayround(1987-1994) worldtradeorganization