The framework of the theory of economic integration was laid out by Jacob Viner (1950) who defined the trade creation and trade diversion effects, the terms introduced for the change of interregional flow of goods caused by changes in customs tariffs due to the creation of an economic union. He considered trade flows between two states prior and after their unification, and compared them with the rest of the world. His findings became and still are the foundation of the theory of economic integration. The next attempts to enlarge the static analysis towards three states+world (Lipsey, et al.) were not as successful.