The aim of the paper is to quantify changes in public finances in the countries of the Visegrad Group through the area of the magic triangle of public finances, with an emphasis on the years 2020 and 2021. Using mathematical and statistical methods, we found the absolute and relative primary values of the year-on-year changes in public revenues, public expenditures and public debt since 2016 and substituted in the formula for calculating the area of the magic triangle. We found that in the long term, the magic triangle in the Czech Republic and Poland shows the largest area. The disease of COVID-19 significantly affected the development of aggregate public finances, which was confirmed especially in 2020. In 2020, the area of the magic triangles decreased significantly from 44.8% (Hungary) to 60.2% (Poland). In 2021, all V4 countries will see an improvement in financial indicators and, at the same time, an increase in the area of the magic triangles of public finances, which signals the progress of the public finances situation.

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The aim of the paper is to divide the OECD aggregate data and analyze the revenues and expenditures of the Slovak (local, regional) self-government. The reason is the absence of these OECD data. The aim of our article is to analyze the system of revenues and expenditures of territorial self-government, which was created by fiscal decentralization, in the conditions of the Slovak Republic during the period 2009-2018. This is based on the OECD methodology, which divides income into five areas, namely taxes, grants and subsidies, tariffs and fees, property income and social contributions. Expenditure areas correspond to the classification according to the functional classification COFOG and reported as a share of GDP.In the area of income, tax revenue is a more important component in the case of local self-government. In all expenditure areas, the regional self-government shows lower expenditure, except for health and social security.

The economic indicators of the new member states of the EU that joined after 2004 have been generally positive. In this paper, we analyse and interpret the economic development results of the 11 new Member States from the Eastern bloc. The set of individual economic indicators gives us a relatively realistic picture of the differences in development in individual post‑communist countries. The paper points out several factors which, in principle, create two groups of countries for us in terms of the development of economic indicators: A more progressive group of countries, which for the most part is showing progress towards catching up with the EU average, and a less progressive group, whose pace of convergence is significantly slower.