The thesis devoted to developing scientific and methodological instruments for assessing the national economy's investment potential and its main determinants, substantiation of mechanisms for implementing public policy intended to increase it. Theoretical bases of the definition of scientific research tendencies concerning the management of the investment potential of the national economy were deepened on two criteria: the level of closeness of scientific research and the evolutionary-temporal dimension. It allowed classifying the areas of interdisciplinary research depending on the closeness of their relationship with the theory of research management on investment management and clarifying the stages of its development. For this purpose, it was generated a sample of 25,567 scientific publications (according to the database Scopus) devoted to research on investment management research on investment management for the period 1991–2020. It was found that clusters on the theory of management of the country's competitiveness, investment attractiveness, and climate have the highest interrelationships level. According to the analysis results in the evolutionary-temporal dimension, it was identified five most significant stages of development of the theory of investment potential of the national economy.
Thesis deepened the typology of approaches to assessing the investment potential of the national economy, which differs from the existing complex considering three criteria: the object of evaluation, the nature of changes in indicators and sources of their formation, describe their nature, advantages, disadvantages, and limitations in application. The system-structural approach is taken as a basis in the thesis, as it allows considering the levels of the country's ability to attract new and effectively use existing resources to avoid the subjective nature of evaluation. The methodological tools for integrated assessment of the national economy's investment potential have been improved, based on the results of the analysis of a system of factors that describe the country's ability to attract new and effectively use existing resources to increase the investment potential of the national economy.
The system-structural approach is taken as a basis in the thesis, as it allows considering the levels of the country's ability to attract new and effectively use existing resources to avoid the subjective nature of evaluation. The methodological tools for assessing the level of capping of indicators of investment attractiveness of the national economy have been improved, which allowed determining the positive and negative trends of capping components of the national economy's investment potential and to justify their causes.
A toolkit for element-by-element assessment of the impact of government performance indicators on political and civil liberties, political stability of the government, freedom and qualifications of public authorities, public confidence in government actions, public perception of corruption, government's ability to implement policies and regulatory measures) has been developed.
The thesis developed an approach to determining the cointegration between the levels of perception of the country's brand by its external stakeholders, the efficiency of public administration, and the national economy's investment potential, which in contrast to existing VEC models and the use of Pedroni and Kao tests. Empirical results for the period 2000-2019 for Ukraine and EU countries confirm the cointegration relationship between the levels of perception of the country's brand by its external stakeholders, the efficiency of public administration, and the national economy's investment potential.
