The leaders of Poland and Czechoslovakia made the decision about close economic cooperation after they had regulated political relations (treaty of March 13th 1947). The economies of both states were complementary. During the negotiations (from April to July 1947) two sides prepared 14...

In the article there were shown the long-term tendencies, which were observed in the process of national income.s trending. Instead of the concept of income we use also the term product, which is currently applied as the measure of economic activity by international organizations such as IMF,...