Yuliia Yehorova

Tax competitiveness of the country characterizes the ability of the tax system to obtain permanent competitive advantages in attracting external and mobilizing internal financial resources due to the establishment of the optimal level of tax burden and differentiation of fiscal instruments. The complexity of this indicator determines the presence of a number of drivers of its formation. Shadow tax evasion is one of them. The purpose of the study is to assess the impact of the shadow tax evasion of taxpayers on the level of competitiveness of the tax system on the example of 11 European countries from 2011 to 2021. The methodological tools are regression analysis methods, Shapiro-Wilk tests, and Spearman’s rank correlation. It was determined that informal employment, informal production, and unregistered or informal entrepreneurship are the most common methods of tax evasion. Based on the results of the calculations, regression equations of the influence of shadow tax evasion on the level of competitiveness of the country’s tax system were constructed. It has been proven that shadow tax evasion exerts the greatest influence on the level of tax competitiveness of Slovenia (0.32), Romania (0.34), and Croatia (0.26). The least sensitive to shadow tax evasion is the competitiveness of the Czech Republic’s tax system (0.096). For most analyzed countries, this influence is carried out with a time lag of 2 years. Only in Croatia, this influence is the most substantial with a one-year lag.

Acknowledgment
The study is funded by the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No. 09I03-03-V01-00042.
The authors are grateful to the participants of projects “National security of Ukraine through the prevention of financial fraud and money laundering: war and post-war challenges” (2023–2025, state registration number: 0123U101945) and “De-shadowing and regulatory efficiency of environmental taxation: optimization modelling to ensure national security and rational use of nature” (2022–2024, registration number 0122U000777) for numerous discussions and comments.

In the conditions of permanent capital outflow and business registration by residents in other jurisdictions, the issue of developing a country’s marketing strategies for doing business and identifying the most effective mechanisms for increasing international tax attractiveness is urgent. The prerequisite of these processes should be the determination of the level of international tax competitiveness followed by identifying the most significant factors of its growth. The purpose of the study is to assess the level of international tax competitiveness as an element of marketing strategies of Ukraine and some EU countries during 2011–2021. The methodological tools are correlation-regression analysis, the Fisher method, and the multiplicative convolution method. The paper assessed the level of international tax competitiveness as a comprehensive indicator that considers procedural, institutional, moral-ethical, and economic components. The calculations showed that the most competitive are the tax systems of Estonia, Latvia, Lithuania, Croatia, Finland, the Czech Republic, and Hungary. Based on hierarchical and non-hierarchical (k-means method) clustering, 3 clusters of regions were identified. For each of them, based on an analysis of the features of the tax system construction and the comparison of marginal and average values, the criteria for the identification of competing countries and those with common development trends were formed. This makes it possible to determine the most effective mechanisms for the implementation of marketing strategies reforming tax policy from the point of view of increasing its international tax attractiveness.

Acknowledgment
The study is funded by the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No. 09I03-03-V01-00042.
The authors are grateful to the participants of projects “National security of Ukraine through the prevention of financial fraud and money laundering: war and post-war challenges” (2023–2025, state registration number: 0123U101945) and “De-shadowing and regulatory efficiency of environmental taxation: optimization modelling to ensure national security and rational use of nature” (2022–2024, registration number 0122U000777) for numerous discussions and comments.

The study aims to assess the state of Ukraine’s foreign economic security and the challenges associated with its ensuring. The integrated assessment methodology of the Ministry of Economy of Ukraine was employed, which is based on a quantitative analysis of indicators that reflect the state of foreign economic security. It involves the characteristics of each indicator in terms of stimulators or destimulators, their normalization, and consideration of weighting coefficients. In order to identify the long-term trends, the official national accounts statistics, data from the World Bank, and the Economic Development Observatory for the period 2004–2023 were employed; the assessment is based on ten indicators. The results demonstrate that the main factors affecting the foreign economic security index are global economic crises, domestic political changes, and a full-scale war with russia. At the same time, the growth of foreign economic security is recorded in the period of stabilization during the implementation of structural reforms: 2005–2008 – the period after the Orange Revolution, 2014–2016 – the period of growth after the Revolution of Dignity, 2021 – post-pandemic recovery. In 2022–2023, the security index declined to 31.5% and 35.7%, respectively, as a consequence of the outbreak of a full-scale russian-Ukrainian war. The findings also emphasize the need to develop domestic capacities to ensure the sustainability of foreign economic activity, as well as the importance of maintaining and planning national export infrastructure in the face of global challenges.

Acknowledgment
This article is published as an output of the project VEGA 1/0392/23: “Changes in the approach to the development of distribution management concepts of companies influenced by the impact of social and economic crises caused by the global pandemic and increased security risks” and funded by the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No.09103-03-V01-00042.
This study was financially supported by the NATO SPS Program “Security of territorial communities: evidence from the Eastern European countries”.
In addition, this article is published as an output of the project “Economic bases for managing Ukraine’s debt security during martial law” (No. 0121U112685).

The structure of the higher education market in 2012–2021 in 38 European countries was analyzed using concentration levels and Herfindahl-Hirschman indices based on the number of higher education institutions and their share in the QS World University Rankings, and the number of students. This market in 2021 has a low concentration: the 3 countries with the largest number of higher education institutions (Germany, Ukraine, France) covered about 36% of the market in total; the 3 countries with the largest number of universities in the QS (United Kingdom, Germany, Italy) – 5%; the 3 countries with the largest number of students (Germany, France, United Kingdom) – 37%; and the 3 countries with the largest number of foreign students (United Kingdom, Germany, France) – 5%. Using parametric and non-parametric comparison tests, it was found that although the number of higher education institutions and students does not generally depend on the population’s income level, the number of universities ranked in the QS and foreign students does. The correlation analysis revealed that GDP and GNI, population, and separately the employment and unemployment rates (for ranked universities and foreign students) are important factors that determine the uneven structure of the higher education market. The identified factors formed the basis for clustering countries using Ward’s hierarchical method, which revealed the clear existence of 3 clusters: the smallest of them accumulates the 4 largest European economies with the most ranked universities; the largest (24 countries) is quite diverse, which indicates relatively equal opportunities in the market and its unification.

Acknowledgment
Tetiana Vasylieva and Artem Artyukhov thank project 0122U000772, and Nadiia Artyukhova thanks project 0124U000545 for carrying out their part of this research.

Considering Ukraine’s corruption scandals at all levels of public governance, combating corruption and enhancing transparency have become a pivotal factor in maintaining the trust of Ukrainian citizens and foreign partners in central and local authorities. It is also an essential prerequisite for Ukraine’s prospective membership in the EU and the allocation of financial assistance from external donors. The study aims to examine how transparency in local governance influences the level of corruption in regional cities of Ukraine. The paper examines how transparency in local authorities relates to different types of corruption, including bribery within municipal services, healthcare, and other public sectors. Utilizing panel data from 24 Ukrainian cities collected between 2017 and 2020 (all-Ukrainian sociological municipal survey and project ‘Transparent, Financially Sound and Competitive Local Governments in Ukraine’), the study employs both random and fixed-effects panel regression analyses to assess the impact of various governance indicators on corruption levels across different sectors, including municipal services, healthcare, and education. The findings suggest that higher transparency of the local authorities is generally associated with lower levels of bribery in the housing and communal services sector (estimation coefficient = –0.204226), in registration and licensing institutions (–0.5353756), in healthcare institutions (–0.2032171), and experience of bribing local authorities (–0.2505674). The analysis concludes that enhancing transparency may significantly reduce corrupt practices within local government operations, thereby strengthening public trust and bringing Ukraine closer to meeting European Union standards.

Acknowledgment
Serhiy Lyeonov, Serhii Drozd, and Yaroslаv Reshetniak thank the project 0123U101945 “National security of Ukraine through prevention of financial fraud and money laundering: war and post-war challenges” for carrying out their part of this research.
This study was funded by the European Union grant “NextGenerationEU through the Recovery and Resilience Plan for Slovakia” (No. 09I03-03-V01-00130) and project VEGA – 1/0392/23 “Changes in the approach to the creation of companies’ distribution management concepts influenced by the effects of social and economic crises caused by the global pandemic and increased security risks.”

During the pandemic and russia’s war against Ukraine, higher education shifted to hybrid and distance learning, with some universities forced to adapt or relocate from occupied territories. This article analyzes the institutional, spatial, and financial aspects of Ukraine’s higher education market (1990–2023), focusing on financial data from 2020–2023 across 24 regions and Kyiv, excluding occupied territories. The calculated results based on concentration levels and the Herfindahl-Hirschman index for the number of educational institutions, students, and postgraduate students showed that the higher education market is highly competitive, with an uneven geographical distribution between regions. The analysis of the level of concentration of financial resources among higher education institutions, calculated based on state funding, showed that the distribution of financial resources among universities is relatively even (in 2023, the 20 largest higher education institutions accumulated more than 43.5% of total state funding). The share of state resources aimed at developing the scientific potential of higher education institutions decreased for the 20 largest higher education institutions from 58% in 2020 to 55% in 2022. Non-parametric correlation analysis revealed a low correlation between the amount of general funding for higher education institutions and the amount of revenues to the special fund for research, which indicates insufficient support and prioritization of the scientific sector in the country. These conclusions can be used in implementing the reform (balancing and optimization) of the existing educational network in Ukraine, which has been actively pursued in recent years.

In an environment where public funding is insufficient to meet international climate and energy goals, feed-in tariffs serve as an essential mechanism to mitigate investment risk and foster the participation of insurance companies as institutional investors in the renewable energy sector. This study aims to investigate whether feed-in tariff policies enhance the evolving effect of insurance sector development on renewable energy consumption across countries and over time. Given that both financial sector capacity and renewable energy transitions are dynamic processes, the analysis explicitly applies econometric techniques designed to capture temporal changes and investment inertia. Using panel data econometric techniques, including fixed effects models with cluster-robust standard errors and dynamic panel estimation (Arellano-Bond GMM), the analysis covers 64 countries from 2000 to 2020. The results reveal that greater insurance sector assets positively correlate with higher renewable energy consumption, with a coefficient of 0.143 (p < 0.01) in the fixed effects model. Still, the strength and significance of this relationship are notably enhanced when feed-in tariffs are in place, as shown by a positive and statistically significant interaction term (coefficient 0.051, p < 0.05) after adding time-fixed effects. The empirical results show that insurance companies can serve as critical institutional investors in the renewable energy sector. Still, their active participation critically depends on supportive policy frameworks, with the positive association between insurance company assets and renewable energy consumption becoming significant, particularly in countries with feed-in tariff schemes.

Acknowledgment
This study was prepared as part of the project IZURZ1_224119/1 (Swiss National Science Foundation) and the National Scholarship Programme of the Slovak Republic.
The publication was funded by the European Union grant “NextGenerationEU through the Recovery and Resilience Plan for Slovakia” (No. 09I03-03-V01-00130) and project VEGA – 1/0392/23 “Changes in the approach to the creation of companies’ distribution management concepts influenced by the effects of social and economic crises caused by the global pandemic and increased security risks.”

As the global community intensifies efforts to transition toward sustainable energy systems, the role of institutional and fiscal arrangements in fostering renewable energy has gained increasing attention. This study aims to assess whether fiscal decentralization contributes to the expansion of renewable electricity generation in OECD countries by analyzing panel data and identifying the direction and significance of this relationship. Utilizing a panel dataset of 34 countries spanning 2000–2023, the analysis employs a fixed-effects regression model with Driscoll-Kraay standard errors. It includes a one-year lag of fiscal variables to ensure robustness. The findings reveal a statistically significant but modest negative relationship between the share of subnational revenues in GDP and the share of renewables in electricity generation, suggesting that greater fiscal decentralization may not automatically incentivize renewable energy adoption. More specifically, the fixed-effects model corrected for heteroskedasticity and autocorrelation indicates that the coefficient for lagged subnational revenue (as a percentage of GDP) is negative and marginally significant (p ≈ 0.057), hinting at a potential delayed inhibitory effect. Additionally, country-level fixed effects demonstrate substantial heterogeneity, with nations like Iceland, Norway, and Canada showing systematically higher renewable electricity shares, regardless of fiscal structure. These results underscore the importance of complementary institutional frameworks and national coordination mechanisms to ensure that decentralization effectively supports climate policy goals.

Acknowledgment
This study was carried out within the framework of a research grant awarded by the Swiss National Science Foundation (grant no. IZURZ1_224119/1) and funded by the European Union grant “NextGenerationEU through the Recovery and Resilience Plan for Slovakia” (No. 09I03-03-V01-00130) and project VEGA – 1/0392/23 “Changes in the approach to the creation of companies’ distribution management concepts influenced by the effects of social and economic crises caused by the global pandemic and increased security risks”.

Type of the article: Research Article

Abstract
Socio-economic development in the EU countries is a complex process encompassing both social and economic progress. It involves enhancements in living standards, quality of life, and overall well-being, alongside economic growth and structural changes. Thus, the paper aims to identify and assess the key parameters for clustering EU countries by the components of their socio-economic development. The study utilized fifteen indicators from the Social Progress Index and the Human Development Index, reflecting different components of countries’ social development. Using the k-means method, the EU population is divided into three clusters (13, 5, and 9 countries, respectively) based on their similarity in social development. Then, using the decision tree method, the above indicators were assessed, including the following: “Nutrition and Medical Care,” “Health,” “Environmental Quality,” “Rights and Voice,” “Freedom and Choice,” and “Advanced Education.” These indicators are used as the key parameters for clustering countries by components of socio-economic development; therefore, their change largely determines the positions of countries as a whole and, accordingly, their convergence at the EU level. The study found significant differences between EU countries in their socio-economic aspects, particularly between the “old” and “new” members. The results obtained can be used to justify the priorities of EU socio-economic policy to ensure overall progress.

Acknowledgment
This article was published as an output of the project VEGA 1/0392/23: Changes in the approach to the development of distribution management concepts of companies influenced by the impact of social and economic crisis caused by the global pandemic and increased security risks. Funded by the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No. 09103-03-V01-00042.