A large body of recent quantitative work on the 'diversity detriment' hypothesis finds that ethno-religious diversity is linked with a host of societal ills, implying in turn a strong challenge to multiculturalist theory and policies. Given the stakes, the appropriate conceptualization and...

A growing body of research shows that COVID-19 both reflects and exacerbates existing inequalities. However, there are significant gaps in this research area with respect to 'horizontal' or group-based inequalities in Global South countries. Lack of group-disaggregated data often contributes. In...

Inequality and social exclusion receive considerable contemporary policy attention. In the field of international development, inequality - both vertical (between individuals and households) and horizontal (between groups) - is a core concern in the 2030 Agenda for Sustainable Development....

Across the world, we observe different experiences in terms of inequality between migrant and 'host-country' populations. What factors contribute to such variation? What policies and programmes facilitate 'better' economic integration? This paper, and the broader collection of studies that it...

The relationship between social mobility and inequality is well studied in the literature, but far greater attention has been paid to 'vertical' than to 'horizontal' inequality. This paper focuses on mobility and horizontal inequality between ethnic, racial, and culturally-defined groups. Not...

A considerable body of research suggests that horizontal inequality between ethnic groups has major socioeconomic implications, in particular for peace and economic development. Much of this work focuses on horizontal inequality as an independent causal variable, rather than an outcome of...

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...

This paper provides a systematic review of quantitative literature investigating the success of affirmative action (AA) policies in addressing socio-economic inequalities between ethnic groups in education and employment. We focus on two of the most influential national experiences: caste-based...

Despite the good intentions behind affirmative action (AA) policies to mediate 'horizontal inequalities' between ethnic groups, the evidence on their effectiveness remains open to debate. In this study, we conduct a systematic review of the literature with global scope, to add new clarity on...

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...