Susanne Frick, Andrés Rodríguez-Pose, 14 February 2018

Urban concentration is typically deemed to lead to greater national economic growth. This column challenges this view, using an original dataset covering 68 countries over the past three decades. Urban concentration levels have decreased or remained stable on average, though these averages hide widely diverging trends across countries. Although concentration has been beneficial for high-income countries, this hasn’t been the case for for developing countries.

Samuel Bazzi, Arya Gaduh, Alex Rothenberg, Maisy Wong, 07 January 2018

Fostering a broad and inclusive sense of national identity is vital for long-term social cohesion, but it is difficult to achieve in light of rapidly growing local diversity. This column uses the example of Indonesia’s Transmigration Programme to show that residential mixing, linguistic differences, and the extent of political and economic competition between groups determine whether diversity leads to integration, social isolation, or segregation – all of which can be influenced by good policy. Properly implemented, such policies both increase social cohesion and encourage greater nation-building.

Zovanga Kone, Maggie Y. Liu, Aaditya Mattoo, Çağlar Özden, Siddharth Sharma, 30 November 2017

Indians, and in particular men seeking education and jobs, display a puzzling reluctance to cross state borders. This column explores the reasons for this surprising migration pattern. A major culprit is India’s system of ‘fragmented entitlements’, whereby welfare benefits are administered at the state level, and state residents get preferential treatment when it comes to higher education and government employment. These administrative rules prevent the more efficient allocation of labour across the country.

Andrés Rodríguez-Pose, Viola von Berlepsch, 10 November 2017

Research on the economic impact of migration on hosts and the migrants themselves has tended to focus on the short term. This column traces the economic impact of population diversity in the US resulting from the Age of Mass Migration of the late 19th and early 20th centuries. High levels of population fractionalisation have had a strong, positive influence on economic development, while high levels of polarisation have undermined development. Despite a stronger effect on income levels in the first 30 years following the initial migration shock, the relationships are found to be extremely long-lasting.

Khulan Altangerel, Jan van Ours, 06 October 2017

The Immigration Reform and Control Act of 1986 was the first major reform intended to control and deter illegal immigration to the US through legalisation of unauthorised immigrants, increased border security, and sanctions on employers that hired unauthorised immigrants. This column uses data from an annual survey of Mexican households to show that the Act had a negative and significant effect on undocumented migration. However, since the Act’s legalisation programme was active for only a few years, its long-term effects appear to have been limited.

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