Approaches and methods of qualitative and quantitative analysis of business processes are analyzed, their advantages and disadvantages at application in an estimation of business processes of the enterprises and the organizations of various spheres of activity are defined. A method for determining the economic efficiency of the implementation of an automated design system, as well as indicators and criteria for assessing the economic efficiency of the implementation of an information system in the reengineering of business processes. The main examples of quantitative indicators are considered, in particular: process indicators, product (service) indicators and consumer and stakeholder satisfaction indicators. In the course of the research, recommendations were developed for the creation of a generalized system of indicators for assessing the business processes of enterprises and organizations, regardless of their field of activity.

The paper analyses and describes key social and demographic trends affecting the business in current conditions. The present research aims to establish logical coherence and feedback between economic development and basic socio-demographic indicators in European countries, including the experience of Latvia and Ukraine. The challenge of the research leads to answering the question how demographic processes affect and drive the economy and how this mechanism could be used to predict essential trends of future development. The methodology of cluster analysis, statistical and regression methods were employed for modelling. Cluster analysis was applied to depict an economic cartogram and merge some European countries in particular clusters by current socio-demographic and economic criteria. As a result, this approach allowed us to compare Latvia and Ukraine as highlighting representatives of different economic clusters and distinguish important similarities and differences. Statistical data were based on the following indicators: GDP, income, employment, age structure, gender, population aging, location, migration etc. These parameters were analysed due to their dynamic change. Regression methods allowed to establish the whole system of indicators affecting the business environment in Latvia and Ukraine. For instance, the results confirmed the explicit impact of migration trends on business and social development.

The problem of significant shadow economy in Ukraine has been very important since Ukraine independence. But due to its peculiarities as an economic phenomenon, it is difficult to assess completely the degree of its influence on the development of the national economy. Besides, the influence of external and internal destabilization factors of economic and political environment in Ukraine (military aggression in the East, annexation of the Crimea, the pandemic of coronavirus disease 2019 (COVID-19), caused by SARS-CoV-2, high levels of corruption, etc.) distract attention from equally important problems of the development of the national economy. In the context of the impact of shadow economy on the national one, the volume of lost GDP and decrease in tax revenues are more considered more often, but the impact caused by shadow level of the national economy is reflected not only in the above-mentioned indicators of the Ukrainian economy development, but also in many others. This particularly concerns the level of inflationary processes as an essential indicator that, combining the economic and social aspects of the country's development, reflects the state of the national economy and its future development prospects. The existing relationship between inflation and the level of shadow economy is reflected in the direct correlation between these indicators and is characterized as direct. At the same time, like the strengthening of inflation processes results in the increase in the level of shadow economy, the increase in the level of shadow economy results in the inflation growth. That is, the identified connection is bilateral, but not equivalent. Available statistics data do not confirm a significant decrease in the level of shadow economy with the decrease of inflation, which is due to the need of carrying out significant and thorough work on its development, which is not limited by the level of inflation decrease. The decrease in the level of shadow economy in Ukraine by 1% will potentially reduce the inflation rate by 2%. The existence of such connection creates the possibility of regulating inflation level due to the level of the shadow economy decrease, expanding the existing tools for regulating inflationary processes, as well as the additional opportunities for further development of the Ukrainian economy.

This research analyses marketplaces in Europe and some other developed countries in order to determine their impact on global trade and business. The paper aimed to answer an important question - how e-commerce could transform modern business taking into account digital changes, a boom of cryptocurrency erasing trade borders and globalization. Sufficient evidence of this transformation is illustrated. A subsidiary objective of this research involves the building of a logical model describing correlation between marketplaces as integral part of e-commerce and global business development. Statistical data were based on variable indicators describing four categories of trading platforms, particularly online stores, price aggregators, marketplaces and classifiers. In addition, global indexes and macro-economic criteria were used in analysis. The methodology of statistical and regression methods was employed for economic-mathematical modelling. This allowed revealing the most important indicators affecting e-commerce and to create reasonable predictions for global business and trade. The research highlights important trends in the development of e-business under the digital economy.

Recently, the sustainable development concept became a crucial issue for every country of the world. Ukraine isn't exception. The main idea of sustainable development is to find a model that would balance the economic development, social sustainability and environmental challenges. In this study, we selected indicators and indexes to measure the achievement of sustainable development goals in Ukraine and the EU countries. These calculations allow to group countries and evaluate their effectiveness. The comparative analysis concludes that the level of sustainable development can be well described on the basis of a limited set of diagnostic features. Set of indicators must be individual for every country in order to obtain representative data. Keywords: sustainability indicators, European Union, GDP per capita based on purchasing power parity, social development, economic inequality, Gini index 2. BACKGROUND One of the many accessible indicators, that characterizes the social and economic development is the gross domestic