Some people wrongly consider that some countries became well-developed as a result of capitalism system but other countries are poor because they accepted another economic system. Namely capitalist system has permitted to create mechanisms of poverty of people. The dynamics progress of the development of world economy throws doubts on the paradigm of the theory that international trade always has advantages for all countries of the world. The experience of space and time of all poor countries reveals the weakness of these theories. International economic relations can encourage both sides only when both countries are well-developed.