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The present study analyses wage income inequality in Bulgaria during the period 2010-2019, using data from the National Revenue Agency (NRA) on the actual incurred income of taxpayers and survey data on wage income from the Household Budget Survey of the National Statistical Institute (NSI). Key indicators of income inequality are derived under both approaches, which are compared and evaluated through descriptive analysis. The NSI survey data permanently underestimates the level of income and inequality in its distribution, as evidenced by the Gini coefficient, the decile and percentile ratios, as well as other indicators based on them.

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Research on social entrepreneurship (SE) has increased significantly over the past ten years, with growing interest in the ecosystems that support initiatives to address social problems with innovative solutions. Such ecosystems can facilitate solutions to society’s wicked problems on a much larger scale. However, there is a lack of research on the nature of such ecosystems, the essential players in them and the factors driving their development and sustainability. The current study aims to fulfill this research gap. Based on a systematic literature review, the study analyzes 43 peer-reviewed papers related to SE ecosystems and SE efforts that address environmental problems. It is found that there are at least 24 patterns/types of SE ecosystems classified into five general groups. Moreover, a diverse set of factors support SE ecosystems and facilitate them to thrive faster and more sustainably. These ecosystems often develop around particular social problems. Using environmental challenges as an example, four groups of significant environmental problems solved by SE ecosystems and SE are identified. The key findings are presented as a comprehensive study framework, which is the basis for a recommended research agenda.