Since the 1964 United Nations Conference on Trade and Development, less developed countries (LDCs) have been united in expressing concern over their trade problems and long-run balance of payment deficits. The LDCs feel that the more developed countries (MDCs) discriminate against their products by use of tariffs. Tariff relief sought by LDCs includes reduction of tariff rates as well as effective rates applied to raw materials and semiprocessed products.
Tariff relief for LDCs means that domestic industries in the MDSs face stronger competition from those imports that are less costly to produce in other countries, For U.S. growers of winter vegetables, this competition has become intense. Several vegetables produced in Mexico compete with Florida's in the U.S, winter market.