Abstract
The article deals with developing determination methods of coefficient parameters influencing economic system indices. It is necessary to assess how economic indices respond to external and internal disturbance while making reasonable managerial decisions within economic systems. The research aims to develop a tool alternative to flexibility, as the use of the latter is not comfortable when assessing economic systems performance due to the need to present influence factors variations in percentage terms. It is based on the sensitivity theory that resides in the fact that sensitivity functions are used to assess system responses following by calculating influence coefficients related. The developed theory and method can be used in different cost management tasks and break-even operations at enterprises and allow to carry out system analysis of different situations within an economic system at a micro-level. The article illustrates the suggested tool applied to the present value, which is one of the most important issues in economic theory. It should be noted that the article searches both the influence of separate factors such as annual rate, the number of years, expected value on the present value cost and the combined influence of the mentioned above on the cost, return rate and return value.
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