The World Development Report is one of the flagship annual reports for the World Bank: for 2023, the theme is “Migrants, Refugees, and Societies.” The report defies a simple summary, but here are a few key points.

The World Bank defines “migrants” as those who are living outside the country of their nationality: thus, someone who emigrates to the United States would be counted as a migrant unless or until they became a citizen, and then wouldn’t count as a migrant any longer. With this definition:

As defined in this Report, there are globally about 184 million migrants (about 2.3 percent of the world’s population)—37 million of them refugees:

• About 40 percent (64 million economic migrants and 10 million refugees) live in high-income countries that belong to the Organisation for Economic Co-operation and Development (OECD). These are high- and low-skilled workers and their families, people with an intent to settle, temporary migrants, students, as well as undocumented migrants and people seeking international protection. This number includes 11 million European Union (EU) citizens living in other EU countries with extensive residency rights.
• About 17 percent (31 million economic migrants) live in Gulf Cooperation Council (GCC) countries.
  Nearly all of them are temporary workers with renewable work visas. They represent, on average, about half of the population across GCC countries.
• About 43 percent (52 million economic migrants and 27 million refugees) live in low- and middle-income countries. They moved primarily for jobs or family reunification or to seek international protection.

The share of migrants in the global population has remained relatively stable since 1960. However, this apparent stability is misleading because demographic growth has been uneven across the world. Global migration increased more than three times faster than population growth in high-income countries and only half as fast as population growth in low-income countries.

That final sentence, of course, is part of the reason for much of the political turmoil over immigration in high-income countries.

At the most basic level, the economics of migration starts from the evidence that the migrants themselves benefit. They may benefit in some cases because they are moving to places of greater opportunity, or in other cases because they are escaping repression or persecution, but their gains are real and should appear in the social calculus. But migration also affects non-migrants in both the sending and receiving countries in a variety of potentially positive and negative ways, and so political controversy is inevitable.

The World Bank suggests that one framework for thinking about these issues from the standpoint of the receiving country is the “match-motive matrix.” When immigrants are a good match for pre-existing needs in the receiving country and, the receiving country as a whole will gain. When the match is poor, as when the migrants do not have skills needed in the receiving country and perhaps are refugees seeking only to escape persecution, then the costs for the receiving country may exceed the benefits.

From the standpoint of those remaining in the origin country, migrants to other locations can also bring benefits by sending remittances and providing knowledge transfers. In some cases (nurses from the Philippines are a commonly cited example), the fact that migrants will go to work in other countries provides a strong reason to build up domestic institutions that can provide skills to those remaining in the country of origin as well.

The report works its way through the policy choices that need to be made in sending countries, receiving countries, and multilateral agreements to increase the benefits of migration and, in the case of refugees, to find ways to share the costs. I also expect that the ongoing spasm of immigration across the southern US border will lead to policy changes. Here, I’ll just close with a broader theme: rules about migration are in many ways similar to rules that affect society as a whole. For example, how can we support children from families with low incomes and limited educational background to realize their potential as adults contributing to society? How do we support people of diverse backgrounds in living side by side? As the report notes:

This debate plays out in a context in which societies and cultures are neither homogeneous nor static. There is no “pre-migration” harmony to return to. In every society, tensions, competition, and cooperation have always existed across a variety of groups that are partly overlapping and constantly changing. Some of these tensions reflect socioeconomic divides: they are not about migration but about poverty and economic opportunity—and large numbers of migrants happen to be poor. Because many of those who moved or their descendants have been naturalized, some of the cultural issues attributed to migration are, in fact, about the inclusion of national minorities. Migration is also just one of many forces transforming societies in an age of rapid change, alongside modernization, secularization, technological progress, shifts in gender roles and family structures, and the emergence of new norms and values, among other trends.

For some previous posts digging into the economics of immigration, one useful starting point is a symposium in the Fall 2016 issue of the Journal of Economic Perspectives (where I work as Managing Editor):

• “Immigrants, Productivity, and Labor Markets,” by by Giovanni Peri
• “The Impact of Immigration: Why Do Studies Reach Such Different Results?” by Christian Dustmann, Uta Schönberg and Jan Stuhler
• “Is the Mediterranean the New Rio Grande? US and EU Immigration Pressures in the Long Run,” by by Gordon Hanson and Craig McIntosh
• “Global Talent Flows,” by Sari Pekkala Kerr, William Kerr, Çağlar Özden and Christopher Parsons

In addition, there are a number of previous posts about immigration issues. A few examples include:

• “Is Opposition to Immigration Primarily Economic or Cultural?” (November 15, 2019)
• “When New Immigrants First Go to an American Supermarket” (January 3, 2022)
• “Rotational Migration” (June 15, 2022)
• “Some Economics of Refugees” (February 21, 2020)
• “Migration from a Global Perspective” (December 18, 2017)
• “Economics of Immigration: The NAS Report” (September 23, 2016)
• “High-Skilled Immigration” (July 26, 2016)

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