Derkach I. Complex of economic-mathematical models of operation of business on the basis of the conception of the leverage

Financial-economic activity of the enterprises (institutions, organizations) in non-productive sphere. The development of methodological regulations of the leverage theory and development of complex of the economic-mathematical (economic and mathematical) models of system leverage. The methods: the general theory of the systems and system analysis, economic theory and economic analysis, theory and methodology of economic-mathematical (economic and mathematical) modelling, financial and operational management. It is analysed and synthesized existing theories and offered new methods to solve the problem of modelling the strategic decisions in condition of instability of the economic environment using the leverage concept. It is offered and motivated the necessity to introduce into practice the category of system leverage. It is offered and motivated the introduction of marketing leverage category and designed the corresponding economic-mathematical (economic and mathematical) models. It is built the complex of economic-mathematical (economic and mathematical) models on basis of system leverage concerning the activity of the high educational institutions. The enterprises of non-productive sphere, educational process.