Марк Хеллаєр, аспірант, Київський національний торговельно економічний університет Директор компанії "СТА" (Великобританія), ЛІБЕРАЛІЗАЦІЯ ТОРГІВЛІ: ТЕОРІЯ, ПРОГНОЗУВАННЯ НАСЛІДКІВ ВПРОВАДЖЕННЯ ТА ПРАКТИЧНІ РЕАЛІЇ Background. The competitive positions of countries and their companies largely depend on the nature of participation in international economic interaction. It has been proven that countries with high levels of economic development are benefiting from foreign trade through liberalization. However, it remains debatable how much positive expectations identified in trade liberalization theory can be put into practice in economically peripheral countries. The fundamental scientific basis for studying the correlation of economic openness in the context of the impact on economic growth, including ambiguous and contradictory impact of trade liberalization, have been studied by various scholars. However, since antagonists of trade liberalization theory often do not fully understand all the positive effects of its application, research in this area is relevant. The goal of this study is to analyze the development and foundations of trade liberalization theory, as well as to compare projections of the effects of trade liberalization between Ukraine and the EU under the terms of the Deep and Comprehensive Free Trade Area (DCFTA) and the practical realities. The main results of the research. International trade theory provides explanations for the impact of international trade and the distribution of the gains from trade and particularly trade liberalisation through preferential trade agreements. Classical trade theory supports free trade and advocates against tariffs and restrictions. The assumptions behind the classical trade theory are the following: Completely free trade; no subsidies, tariffs, or commercial restrictions; Frictionless inter sectoral transfer of labour. However these assumptions do not hold in the real world and gives rise to the debate on the conditions under which free trade provides Gains from Trade. In the Heckscher Ohlin model of trade, each nation's comparative advantage is traced to its particular endowments of different factors of production: that is, basic inputs such as land, labour, and capital. Since the costs of these inputs in each country will depend on their availability, differences in factor endowments across countries will create differences in comparative advantage. Each country will tend to export items whose production requires intensive use of the factors with which it is abundantly endowed relative to other nations; conversely, each country will import goods whose production requires intensive use of factors that are relatively scarce. Therefore, countries well endowed with land, like Australia and Canada, and indeed Ukraine, are thus expected to export agricultural products (e.g., wheat and wool), while importing products that require the intensive use of labour (e.g., textiles and footwear). The article emphasized that Classical theory and Heckscher Ohlin theory is furth...