The article is devoted to the comparative analysis of the use of environmental taxes and the introduction of environmental innovations in terms of impact on the parameters of revenues and expenditures of the state budget. The study includes 10 countries of Central and Eastern Europe (Bulgaria, Czech Republic, Hungary, Estonia, Latvia, Lithuania, Poland, Romania, Slovenia and Slovak Republic). The analysis period covers 2010–2019. Systematization of scientific research proves the importance of using different tools to ensure sustainable development and greening of the national economy. The main purpose of the study is to determine a more effective form of interaction between government and business in the process of transforming the national economy in the direction of more environmentally friendly products and technologies by economic and mathematical modeling of environmental taxes and eco-innovation impact of budget revenues and expenditures. The calculations consist on the several stages: 1) determining the list of relevant control variables using correlation analysis, which eliminates the problem of multicollinearity; 2) determination of the model specification (fixed or random effects) using the Hausman test; 3) identification of the generalizing effects of the impact of environmental taxation and the eco-innovation index on the indicators of budget revenues and expenditures using a generalized least squares panel regression model with random effects; 4) study of the impact of the main components of environmental taxes and components of the eco-innovation index on the parameters of the state budget using panel regression modelling; 5) determination of short-term and long-term effects of the impact of environmental taxes and eco-innovations on the parameters of budget revenues and expenditures bt auto-regression distributive lag modelling. Stata 12/SE software tools were used for calculations. The study indicates the need to transform approaches to the implementation of state environmental policy. Thus, it has been proven that government incentives for the introduction of environmental innovations in the economy can be more effective than increasing the burden of environmental taxes.

The article attempts to develop a methodology for a comparative assessment of the economic efficiency of banks, including traditional and Islamic banking models. The assessment shows that the stability of financial institutions in Azerbaijan is lower compared to banks where Islamic banking is used. The assessment also shows that there is a strong dependence of the GDP growth rate on the sub-indices of the effectiveness of financial institutions in Azerbaijan, Turkey, and Iran. The methodology of linear regression and a composite index of the economic efficiency of banks are applied. The assessment shows that the influence of the stability of the financial system on economic growth in Azerbaijan, Iran, and Turkey is different. The economic growth rate and the ratio of bank loans to bank deposits in Azerbaijan and Turkey are positively related, but negatively in Iran.

The article aimed to empirically substantiate the features of capital investment in innovation depending on financial stability for Industrial SMEs in the GUAM Organization for Democracy and Economic Development, which consists of four post-Soviet states: Georgia, Ukraine, Azerbaijan, and Moldova. We differentiated the levels of financial stability of industrial SMEs in the region: high, medium, and low. We have determined the positive effect of capital investments in innovation at all levels of financial stability using regression modeling. Regardless of financial strength and capital intensity, investing in innovation provides higher performance indicators for companies than investing in the renewal of fixed assets without modernization. The increase in the efficiency of capital investments in SMEs is more significant for financially stable and less capital-intensive companies than for companies with low financial stability and high capital intensity. Identifying the features of the relationship between the financial stability of SMEs and capital investment will allow the development of effective strategies for economic collaboration within the framework of the GUAM Organization.