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P. A. Braran and P. M. Sweezy Economics of two worlds, The problem of monetary liquidity, some thoughts about mathematical models in relation to economic, external economies vid infrastruture in a two-sectors model, three conceptions of the political economy of socialism, fractile graphical analysis, professor Oskar lange on economic theory of socialesm and Yugoslav economic thinking, problems of motivation and economic theory, les industries motrices et la planification de la croissance d'une économie nationale, aspects of co-existence, transitional planning, prices, incentives and calculation methods, the consumption model and means of its implementation, are there laws of progress?