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  • Working Papers

    Nedelkoska, L., et al., 2025

    De Facto Openness to Immigration

    Various factors influence why some countries are more open to immigration than others. Policy is only one of them. We design country-specifc measures of openness to immigration that aim to […]
    Growth Lab

    Various factors influence why some countries are more open to immigration than others. Policy is only one of them. We design country-specifc measures of openness to immigration that aim to capture de facto levels of openness to immigration, complementing existing de jure measures of immigration, based on enacted immigration laws and policy measures. We estimate these for 148 countries and three years (2000, 2010, and 2020). For a subset of countries, we also distinguish between openness towards tertiary-educated migrants and less than tertiary-educated migrants. Using the measures, we show that most places in the World today are closed to immigration, and a few regions are very open. The World became more open in the first decade of the millennium, an opening mainly driven by the Western World and the Gulf countries. Moreover, we show that other factors equal, countries that increased their openness to immigration, reduced their old-age dependency ratios, and experienced slower real wage growth, arguably a sign of relaxing labor and skill shortages.

    Explore the country rankings in our interactive visualization website and learn more about the project, Leveraging the Global Talent Pool to Jumpstart Prosperity in Emerging Economies.

  • Migration

    Project

    Academic Research

    Leveraging the Global Talent Pool to Jumpstart Prosperity in Emerging Economies

    In this project, researchers measure countries’ degree of openness towards different groups of migrants, and test the hypothesis that more developed economies are more open to international migrants, and in particular to international talent.
  • Working Papers

    Protzer, E., et al., 2024

    A New Algorithm to Efficiently Match U.S. Census Records and Balance Representativity with Match Quality

    We introduce a record linkage algorithm that allows one to (1) efficiently match hundreds of millions of records based not just on demographic characteristics but also name similarity, (2) make […]
    Growth Lab

    We introduce a record linkage algorithm that allows one to (1) efficiently match hundreds of millions of records based not just on demographic characteristics but also name similarity, (2) make statistical choices regarding the trade-off between match quality and representativity and (3) automatically generate a ground truth of true and false matches, suitable for training purposes, based on networked family relationships. Given the recent availability of hundreds of millions of digitized census records, this algorithm significantly reduces computational costs to researchers while allowing them to tailor their matching design towards their research question at hand (e.g. prioritizing external validity over match quality). Applied to U.S Census Records from 1850 to 1940, the algorithm produces two sets of matches, one designed for representativity and one designed to maximize the number of matched individuals. At the same level of accuracy as commonly used methods, the algorithm tends to have a higher level of representativity and a larger pool of matches. The algorithm also allows one to match harder-to-match groups with less bias (e.g. women whose names tend to change over time due to marriage). 

  • Working Papers

    Protzer, E., et al., 2024

    How Wyoming’s Exodus of Young Adults Holds Back Economic Diversification

    A missing ingredient to Wyoming’s diversification efforts is keeping young people and families in the state. By the time people born in Wyoming reach their thirties, nearly two thirds have left – one of the highest rates in the country. Without access to this workforce, it is exceedingly difficult for the Wyoming economy to diversify.
    Growth Lab
    Wyoming is a rural Mountain West state with a high Gross State Product (GSP) per capita, foremostly driven by its fossil fuel sector. The state’s longstanding strengths in resource extraction provide much of its livelihood, including both its private earnings and public finances. Its other industries are comparatively much smaller, but Wyoming would benefit from their expansion in order to smooth out resource-related shocks going forward. Importantly, Wyoming should think on a big scale when considering such opportunities. Middling, business-as-usual growth in its non-resource sectors will not fundamentally do much to insulate Wyoming’s economy against resource busts. One category of diversification opportunities to consider are those in industries tied to the natural endowments of the land. Wyoming generally does well in these sectors, but prospects of further expansion are either highly uncertain or limited in scale. Some of the most promising opportunities are in new energy and critical minerals, but these carry significant technological uncertainty and/or modest income potential. Transformative growth in agriculture is likely to be difficult because Wyoming faces hard constraints on its water consumption, and its tourism income per capita is already among the very highest of any US states. Adding value to raw materials is a commonly-discussed strategy that, in practice, does not work well in the modern economy because raw materials are often easily traded over long distances. While it is therefore vital for Wyoming to pursue economic activities related to its natural endowments, it must also look to its advanced services and manufacturing sectors. Wyoming is a severe laggard in these industries versus other states, and serious action is needed to generate the large pools of skilled labor that they need to succeed. There is widespread recognition that Wyoming is behind on this matter, and the state has made critical investments in education to bridge this gap. The missing ingredient, however, is keeping young people and families in the state. By the time people born in Wyoming reach their thirties, nearly two thirds have left – one of the highest rates in the country. Without access to this workforce, it is exceedingly difficult for the Wyoming economy to diversify. Empirically, young Wyomingites and families overwhelmingly leave the state in favor of larger cities. University of Wyoming graduates especially are attracted to large cities a few hours’ drive away from Laramie, Wyoming (where the University of Wyoming is located). These destinations include Fort Collins and Denver. Even if it wanted to, Wyoming could not wave a magic wand to create a large urban metropolis overnight, and it is therefore necessary to understand what specifically attracts young adults and families to these big cities instead of Wyoming towns so that the latter can compete better. The evidence shows that housing is a surprisingly important factor related to migration decisions on which Wyoming underperforms. Young adults fresh out of university often prefer to live in centrally-located apartments, so that they are close to jobs, restaurants, and friends. Wyoming towns, however, lack dense multi-family housing in their downtown cores as compared to other US towns with very similar overall population. This lack of dense downtown housing suitable for young people contributes to an overall housing supply deficiency, thereby driving up housing prices across the board. It also entails depressed foot traffic in downtowns, leading to fewer customers for local businesses and ultimately fewer urban amenities like restaurants versus Colorado communities – a key result given that surveyed University of Wyoming students report that restaurants are their top desired urban amenity. The main reason there is not denser housing in Wyoming downtowns is because strict regulations have illegalized them. A plethora of restrictions exist around issues like minimum lot sizes, maximum building heights, minimum parking space requirements, maximum dwellings per unit of area, and more. Studies show that Wyoming is more overregulated than other communities when it comes to restrictions on housing density. Other places successfully leave these decisions to the free market rather than government, and Wyoming could remove these restrictions to increase its supply of housing for young people at no cost. There is additionally a lack of funding for arterial infrastructure in Wyoming, such as water and sewage lines, which drives up development costs. A general lack of funding for community assets arguably also affects young peoples’ and families’ migration decisions. There is evidence that community demand for investment outstrips supply in water and transport infrastructure, and that many counties use allotted sales tax expansions (“Penny Taxes”) very frequently. One way Wyoming could direct more funding to its local communities is via an expanded grants management system; Wyoming gets less federal grant funding per person than other rural US states, and based on interviews this is tied to a lack of dedicated staff who can navigate the significant overhead associated with following and applying for grants. Overall, while Wyoming is currently a laggard on advanced service and manufacturing industries there are concrete steps it could take to compete better by retaining more of its young people. Wyoming’s Pathways to Prosperity economic development project has already enacted a number of changes to support that outcome, but more can be done. With denser downtowns and more funding for community assets, Wyoming would bolster both its economic and cultural vitality by keeping its young people and leveraging them to obtain growth in new industries. Related project: Pathways to Prosperity in Wyoming
  • Working Papers

    Martin, D.A., Morales-Arilla, J. & Morales, A., 2024

    Escaping from Hardship, Searching for Comfort: Climate Matching in Refugees’ Destination Choices

    Do refugees settle in destinations that are ecologically similar to their origins? We assess the relevance of “climate matching” theories of migration for Venezuelan refugees in South America. Leveraging social […]
    Growth Lab

    Do refugees settle in destinations that are ecologically similar to their origins? We assess the relevance of “climate matching” theories of migration for Venezuelan refugees in South America. Leveraging social media data, we build and validate the first local bilateral matrix of Venezuelan flows across the region. We measure bilateral ecological similarities in terms of temperature, precipitation, elevation, and distance to the coastline. Performing Poisson Pseudo-Maximum Likelihood gravity models of migration, we show that Venezuelan flows are more likely between ecologically similar areas. Model predictions explain independent measurements of Venezuelans’ settlement choices at both bilateral and destination levels. 

  • Journal Articles

    Kis, A.B., et al., 2024

    Leaving Home: Cumulative Climate Shocks and Migration in Sub-Saharan Africa

    Environmental and Resource Economics, 87, 321-345.

    We combine a multi-country household panel dataset with high-resolution gridded precipitation data to investigate how cumulative climatic shocks affects the decision to leave the households in five sub-Saharan African countries. […]
    Growth Lab
    We combine a multi-country household panel dataset with high-resolution gridded precipitation data to investigate how cumulative climatic shocks affects the decision to leave the households in five sub-Saharan African countries. We find that while the effect of recent adverse weather shocks is on average modest, the cumulative effect of a persistent exposure to droughts over several years leads to a significant increase in the probability for a household member to leave the household. We speculate that this pattern can be indicative of increased migratory flows due to increase in the frequency of extremes.
  • Zahra Asghar
  • Graph shows that people born in each US state move away at very different rates. Those born in Wyoming, however, move away at especially high rates compared to the rest of the US.
  • Journal Articles

    Diodato, D., Hausmann, R. & Neffke, F., 2023

    The impact of return migration on employment and wages in Mexican cities

    Journal of Urban Economics , 135

    How does return migration from the US to Mexico affect local workers? Return migrants increase the local labor supply, potentially hurting local workers. However, having been exposed to a more […]
    Growth Lab
    How does return migration from the US to Mexico affect local workers? Return migrants increase the local labor supply, potentially hurting local workers. However, having been exposed to a more advanced U.S. economy, they may also carry human capital that benefits non-migrants. Using an instrument based on involuntary return migration, we find that, whereas workers who share returnees’ occupations experience a fall in wages, workers in other occupations see their wages rise. These effects are, however, transitory and restricted to the city-industry receiving the returnees. In contrast, returnees permanently alter a city’s long-run industrial composition, by raising employment levels in the local industries that hire them.
  • Journal Articles

    Bahar, D., et al., 2023

    Innovation on Wings: Nonstop Flights and Firm Innovation in the Global Context

    Management Science

    We study whether, when, and how better connectivity through nonstop flights leads to positive innovation outcomes for firms in the global context. Using unique data of all flights emanating from […]
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    We study whether, when, and how better connectivity through nonstop flights leads to positive innovation outcomes for firms in the global context. Using unique data of all flights emanating from 5,015 airports around the globe from 2005 to 2015 and exploiting a regression discontinuity framework, we report that a 10% increase in nonstop flights between two locations leads to a 3.4% increase in citations and a 1.4% increase in the production of collaborative patents between those locations. This effect is driven primarily by firms as opposed to academic institutions. We further study the characteristics of firms and firm locations that are salient to the relation between nonstop flights and innovation outcomes across countries. Using a gravity model, we posit and find that the positive effect of nonstop flights on innovation is stronger for firms and subsidiaries with greater innovation mass (e.g., stocks of inventors and R&D spending), located in innovation hubs or countries that are deemed technology leaders, and that are separated by large cultural or temporal distance.

    Research Summary: The Role of Nonstop Flights in Fostering Global Firm Innovation

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