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Purpose: The purpose of the work is to specify the concept of business system, which allows overcoming the multitude of its treatments and contradiction of scientific research, devoted to its research and allows building the conclusions into the economic theory.

Methodology: A generalized notion of business as a clearly organized corporate economic subject that conducts entrepreneurial activities for the purpose of obtaining income (profit) is offered. For studying it, the methodology of the systemic approach is used.

Conclusions: The specified concept of business system allowed unifying within the common scientific category the existing concepts of economic subject (organizations, companies, corporations, and business structures).

Originality/value: Advantages of the offered concept of business system is systemic character (category “business system” could be used during research in the sphere of management, economics, and law), universal character (the offered concept allowed reflecting internal and external environment of the business system, which allows conducting microeconomic and macroeconomic research on its basis), and clarity (the offered concept reflects the essence of notions of business and illustrated them). The offered conceptual model of modern business system is to be a foundation for theoretical and empirical research, including interdisciplinary.

Purpose: The purpose of the work is to study the characteristics of leadership and to determine its value in the process of decision making in modern business systems, as well as to determine the possibilities of increasing the effectiveness of this process through changing the characteristics of leadership.

Methodology: Target study of the influence of leadership on the process of decision making in modern business systems on the basis of the methodology of the systemic approach is performed, and two additional characteristics of leadership are determined, apart from management style, in the aspect of making of managerial decisions: contradiction of leaders in business system and authority of a formal leader (business manager) in business system and his competence as to involvement of employees into the process of making of managerial decisions, which includes capabilities. Depending on combination of these characteristics, classification of leadership in modern business systems as to criterion of decision making is offered.

Conclusions: It is substantiated that the most preferable type of leadership in a modern business system as to criterion of decision making is highly effective involvement of employees in the process of making of managerial decisions. Capabilities of increasing the effectiveness of the process of making of managerial decisions in a modern system through changing the characteristics of leadership are connected to transition to this type of leadership through overcoming the contradiction of leaders in a business system and increase of competence of the formal leader (business manager) in a business system as to involvement of employees in the process of making of managerial decisions through his training.

Originality/value: It is substantiated that leadership in business system determines only certain characteristics of the process of making of managerial decisions, and no type of leadership can guarantee optimal decisions. With highly effective involvement of employees in the process of making of managerial decisions, the probability of optimal decisions is the highest, so this type of leadership is the most perspective for modern business systems.

Purpose: The purpose of the chapter is to analyze the experience of managerial decisions in modern North American business systems, to develop an American model of decision making in modern business systems, to determine the possibilities of making of optimal decisions according to this model, and to substantiate the perspectives of its improvement.

Methodology: The authors use the methods of systemic, problem, and logical analysis, as well as modeling and formalization.

Conclusions: An American model of decision making in modern business systems is compiled – it is based on divisional organizational structure. This model is contradictory and, like other regional models, has advantages and drawbacks. On the one hand, an important advantage of the American model is making of well-balanced managerial decisions that conform to the interests of all interested parties in the business system (investors, management, employees) and beyond it (consumers, society). This advantage is achieved due to active and systemic marketing, which ensures the fullest consideration of the possibilities of business environment and high adaptability of business systems to its changes. Managers' readiness to take a risk allows them to make nonstandard decisions, thus strengthening the uniqueness and competitive advantages of the business system. On the other hand, high risk component of managerial decisions leads to unsustainable development of business systems in countries of North America and their strong susceptibility to internal and external crises. Another drawback of the American model of decision making in modern business systems is duration of this process due to necessity for consideration of opinions of all interested parties and marketing at all stages.

Originality/value: It is determined that in the conditions of crisis, the American model cannot ensure timely decision making, and this leads to their nonoptimality, which defines the perspectives of improving this model.

Purpose: The purpose of the chapter is to study the peculiarities of making of managerial decisions in modern business systems in countries of Asia and to compile an Asian model of this process, as well as to determine the possibilities and perspectives of making of optimal decisions according to this model.

Methodology: The chapter is devoted to studying the microeconomic aspect of economic development of countries of Asia; it is based on the methods of logical and systemic analysis, modeling of socioeconomic processes and systems, and formalization.

Conclusions: In the course of studying the practice of making of managerial decisions in modern business systems in countries of Asia, an Asian model of this process is compiled – it has the following features: independent making of tactical decisions by linear managers, foundation on model decisions, strong control, marketing only at the level of top management, and feedback with linear managers. The determined peculiarities are oriented at maximum acceleration of the process of making of managerial decisions in business systems. Another aspect of this advantage is insufficient consideration of internal (due to absence of involvement of employees into the process of discussion of decisions) and external (due to weak marketing support) possibilities of the business system.

Originality/value: It is substantiated that Asian model is most adapted and fitting for making of managerial decisions in the conditions of dynamic business environment, when the most important criterion of optimality is the speed of decision making.

The purpose of the chapter is to model the process of decision-making on selection of a certain process depending on the investing strategy.

The work includes consideration of the project on the basis of a simplified simulation model. Modeling is performed by the Monte Carlo method. Criteria of evaluation of the investment project are net investment value and profitability index.

The authors model the process of decision-making by the example of analysis of an investment project. The process is implemented on the basis of the simulation model in the Mathcad program. Three cases of investing are considered: constant, change by linear law, and changed by non-linear law. Criteria of evaluation of investment project are selected, and risks are determined. The corresponding conclusions are made.

The performed research is of the applied value and could be used for modeling real business processes at a company.

Purpose: The purpose of the work is to determine the possibilities and consequences of decision making in modern business systems by the principles of outsource.

Methodology: During studying the perspectives of decision making in modern business systems by the principles of outsource, the method of logical analysis (analysis of causal connections), the method of structural and functional analysis, and the method of formalization are used.

Conclusions: Perspective directions, advantages, and drawbacks of application of outsource for decision making in modern business systems at different stages of this process are determined. Possible variants of decision making in a modern business system by the principles of outsource and their consequences are determined: information and consultation decision support, business system's overcoming a crisis, optimization of certain business processes, and loss of independence of business system and path to its reorganization.

Originality/value: As a result, it is substantiated that outsource is a perspective tool of making of managerial decisions in modern business systems. Various directions of application of this tool are accessible at each stage of the process of making of managerial decisions in a modern business system. The advantages of decision making by the principles of outsource are attraction of additional resources, access to possibilities of automatization, and low expenses, and the drawbacks include the complexity of organization of this process and temporary character of obtained advantages. Too active usage of outsource and transfer of most managerial decisions to it may lead to loss of independence of the business system and increase of the risk of its reorganization. That's why the principles of outsource are recommended for making of certain managerial decisions by business systems in the period of crisis and by newly formed business systems and those that experience deficit of resources.