Table A2

Variables description and main data sources

VariablesDescriptionDefinition and source
Migration
ImmigrantsStock of immigrants in country i from country j in year tData are from United Nations “Trends in International Migrant Stock: The 2017 revision”, Department of Economic and Social Affairs. Population Division (2017). Data were obtained from population censuses. In most of the cases, in most countries or areas, international migrants have been equated with the foreign-born population (whenever this information is available). In countries lacking data on place of birth, information on the country of citizenship of those enumerated was available. When both information was available, they have been compared effectively equating
EmigrantsStock of emigrants from country i to country j in year t
Trade and FDI
Extensive marginA dummy variable that equals 1 if country i achieved an RCA of 1 (or more) in product p at time t conditional on having RCA = 0 in the previous periodProduct data of EU-27 countries and of 20 MENA countries with more than 200 countries. For 1990–2000 the data are from The Center of International Data of Robert Feenstra. For more recent data (2005–2015) they are from the UN COMTRADE with corrections implemented by Bahar et al. (2014) for the bilateral trade data. Products classified according to the Standard Industry Trade Classification (SITC) (Rev. 2) with a 4-digit level of detail amounting to more than 700 single products
Intensive marginCompound average growth rate (CAGR) in the export of product p (at 5-years interval)
ImportsValue of imports (including product p)
Accumulated exportsThe accumulated exports of products (different from p)
FDIThe sum of the stock of FDI (inflows plus outflows)Bilateral FDI 1990–2012 stocks from OECD International Direct Investment Statistics (2013) 
Gravity model variables
Log (Migrantsijt)Biltaral migration stocks from i residing in j at time tUnited Nations “Trends in International Migrant Stock: The 2017 revision”, Department of Economic and Social Affairs. Population Division (2017)
ColonyDummy equal to 1 if country i and j share a colonial past and 0 otherwiseCEPII Gravity Dataset (Head et al., 2010; Head and Mayer, 2014)
Common coloniserDummy indicating if two countries have had a common colonizer after 1945
Common religion beliefsIndex of Religious proximity (Disdier and Mayer, 2007)
Common languageDummy equal to 1 if country i and j share a common official or primary language and 0 otherwise

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