The third United Nations Sustainable Development Goal promotes health and well-being. Despite the existence of academic literature examining the relationship between health and income inequality, evidence on the role of healthcare systems in this inequality remains limited. This article aims to analyse the extent to which healthcare systems are associated with differences in economic inequality. To this end, a balanced panel of 27 European Union countries for the period 2005–2022 is used, applying t-tests for differences in means and linear regression models using S80/S20, Gini and Palma inequality measures. The main results show that countries with a Social Health Insurance System (SHIS) exhibit, on average, lower levels of income inequality, despite not being the highest spenders on healthcare. On the other hand, healthcare expenditure has a negative and statistically significant relationship with inequality, whereas in countries with a Mixed Healthcare System (MHS), this association is not statistically significant. A disaggregated analysis of public and private spending indicates that public expenditure is particularly relevant in SHIS countries being negatively associated with income inequality, whereas this relationship differs in countries with a National Health System (NHS). Thus, it is concluded that healthcare systems display significant differences in the relationship under study.
Ferreiro-Pérez et al. (Sat,) studied this question.