Abstract. The article presents results of the study of relations between the enterprise life cycle and the efficiency of investment in the context of dynamic, rapid changes in the conditions of enterprises operation and development. It is determined that one of the main factors of success is the introduction of innovative technologies in the production process, which cannot be carried out without attracting investments. It is the investment activity of enterprises that determines the dynamics of their development, the level of competitiveness and the growth of productive resources, which affects the efficiency of their activities. It is proved that it is relevant to take into account the possible negative effects of the influence of factors divergence. The purpose of the study is to analyse possibilities of determining the impact of life cycle stages on the efficiency of investing in an enterprise. The methodological basis of the research is grounded on the general scientific methods of dialectics, observation, measurement, and formalization; methods of the system and statistical analysis. In particular, to determine the influence of internal factors on the indicators of the efficiency of investment activity of the enterprise at the stages of its life cycle, deterministic factor analysis is applied; methods of systematization and synthesis, analysis and synthesis are also used. It is determined that the construction industry plays a special role in the national economy since its development creates a synergistic effect for the development of other industries, increases the standard of living of the society through solving certain socioeconomic problems. The analytical data of construction enterprises activity in Dnipropetrovsk and Odesa regions of Ukraine became the basis for the approbation of the proposed approach. The use of the life cycle model of the enterprise, which includes the stage of growth (slow and rapid growth, stability stage) and the stage of the fall (slow and rapid fall, crisis stage), is substantiated. The features of investment activity according to the given stages of the life cycle of the enterprise are considered. It is determined that the growth and fall stages have a different effect on the nature of the investment indicators, which depends on certain factors. Further research is aimed at improving the mechanism of monitoring the environment in order to determine the force of factors influence on investment activity and implementation of preventive measures. The lack of a rapid reaction of the company to changes in the environment can lead to a crisis state of management, which determines the high degree of significance of adaptation for any life cycle of the enterprise.
Different methods of calculating the payback period of investment funds are considered in this article. This indicator takes no less important significance, along with other factors at the estimation of economic efficiency of alternative variants of investment projects. Because exactly it determines the rate of return of the enclosed capital. Paid special attention to the calculation of the payback period of investment in construction projects.
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