European Economic Integration, the historical development of the world market, world economy, development trends, the international division of labor, the World Trade Organization, GATT, the IMF, the World Bank.

Public Economics in Mixed Economic System, Economic Justification of State, Welfare Economics: Efficiency and Justice, Public Goods and Private Goods which suppliedas a means of public, Public Choice, Public Production and Bureaucracy , Externalities, Utility-Cost Analysis, Market Failure Theory and Public Choice, Privatization Theory and Privatization of Public Enterprises, Optimal Taxation Theory, New Exchange Dynamics in Economics and New Status of The State.