Dynamic equity in personal income tax design: Theory and application to Vietnam’s 2026 reform

Public procurement has been the subject of research for a long time in the work of scientists from both the economically developed countries and those undergoing the transformation of public finances. Their research comes from different points of view, namely from the essence of the definition, the process of their conduct, the problems of the legislative framework to their effective implementation. In addition, the issue of electronic public procurement, which can greatly enhance the transparency of this process and reduce the level of corruption inherent in this area in all countries without any exception, is becoming increasingly relevant in recent times.
Based on the conducted analysis, the article proposes the definition of the term of public procurement, defines the principles of public procurement as a controlled subject in the electronic environment of their conduct, and systematizes the basic indicators characterizing the effectiveness of public procurement. Based on the Granger causality method, an analysis of efficiency was performed and the basic indicators determining the level of savings in the public procurement system were determined. It is established that the use of Granger causality in changing the amount of savings in the system of public procurement gives only a quantitative characteristic. For a more complete picture quantitative analysis is supplemented with qualitative parameters.

The article proposes a way of determining the future directions of financial support for the social development needs. To this end, the Tintner method of consecutive differences is used. The practical application of this method allows for pre-selecting the best curve that describes the level of financial support for social needs. The model off inancial support for local self-government is determined. The adequacy of funding for the needs of local budget social development is analyzed. The share of expenditure of local budgets in Ukraine on health care, intellectual and physical development, education, social protection and social security is described. A number of challenges when it comes to financial support are considered, both from a theoretical perspective and those confirmed by actual calculations.

Due to a huge financing gap in many developing nations, governments use budget deficit to facilitate growth and development. However, deficit financing deepens the economic woes of these economies, leaving them in a vicious cycle of deficits. In Nigeria, for instance, fiscal deficits cause country’s bad performance and ranking both in global growth and development indicators. Thus, the use of fiscal deficit to enhance economic performance has proved to be futile and also has left bad economic consequences. Based on the econometric method of Autoregressive Distributed Lag, this study examines how selected macroeconomic indicators influence fiscal deficits in the budgetary policy of Nigeria. Historical data between 1981 and 2017 were used for the study. The study shows a significant positive effect of inflation, oil revenue, and lagged exchange rate on fiscal deficits. There is also evidence that external debt and current exchange rate decrease the level of fiscal deficits. However, the research did not prove robust evidence of fiscal deficit persistence. Government policy should target low level of inflation and exchange rate appreciation as well as the productive investment of oil revenues and economic diversification as the panacea for persistent use of fiscal deficits.