Inequality is a global challenge that weakens social cohesion and makes economies and people living in disadvantaged environments more vulnerable. Inequality is also a symptom and prelude to other ills; it hinders economic growth and limits the possibilities that economic growth has to improve people's lives. This work attempts to be an updated review of the main aspects related to the study of inequality, aimed at those who are beginning their journey in the study of such an important issue. We begin by reviewing the various types of inequality and their measures, examining their current situation. The reasons why we should be concerned about inequality are analyzed, distinguishing between economic reasons and reasons of social justice. After examining the available evidence about the possible causes of inequality, the different actions that can lead to its reduction are described, paying attention to the difference between predistribution and redistribution, since both must be considered important. The paper concludes with some considerations about the difficulties that inequality presents for the development of a common life project in a free society.
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