Affirmative action, or positive discrimination favouring the members of marginalized populations, is a key policy approach for addressing group-based inequalities along ethnic, religious, and racial lines (e.g. horizontal inequalities). It is adopted in dozens of countries around the world in...

Affirmative action, or positive discrimination favouring the members of marginalized populations, is a key policy approach to addressing group-based inequalities. It is adopted in dozens of countries around the world in the areas of, for instance, university enrolment, public employment, and...

How do social group boundaries evolve? Does the appearance of a new outgroup change the ingroup's perceptions of other outgroups? We introduce a conceptual framework of context-dependent categorization, in which exposure to one minority leads to recategorization of other minorities as in- or...