The purpose of this session is to explore social security, debt, trade, income, transactions and regulation. These areas have been and still are of great interest and significant importance as on one hand they are affected by economic crises and on the other hand they are considered as potential contributors to economic crisis. The first paper focuses on wealth and income inequality. It employs a machine-based technique in order to present a calculation of wealth and income inequality with a high degree of precision compared to the already available methods. This is needed to convey the extent to which inequality is properly attributed to the large number of impoverished people, or alternatively to the concentration of wealth or income at the top of the distribution. The second paper targets transactions made with cryptocurrency and more specific Bitcoin. Its purpose is to widen the analysis of the factors that can explain the development of Bitcoin from a macroeconomic, financial and political perspective. The goal of the paper is to determine the nature of Bitcoin in a clearer manner and identify possible policy implications to the financial regulation. The third paper seeks evidence of the contribution of social security to the debt of a country with the use of an econometric model. The discussion is of interest to authorities and professionals around the globe as they argue on whether social security adds to the country debt, which very much depends on the social security system that each country operates. The outcome can give certain directions to the relevant authorities and policy makers. The fourth paper uses an econometric model to investigate whether tariffs affect the debt of a country, a question that has been debated a lot the last couple of years, as tariffs have been recently offered as a means to increase government revenue and thus reduce the national debt of a country. The quantitative evidence can support proposals for the policy than may be followed in terms of the introduction of tariffs.