" The fraction of international migrants in the world population in 2017 was roughly what it was in 1960 or in 1990: 3 percent.1 The European Union (EU) on average gets between 1.5 million and 2.5 million non-EU migrants every year from the rest of the world. Two and a half million is less than one half of one percent of the EU population. Most of these are legal migrants, people with job offers, or those who arrive to join their families. There was an unusual influx of refugees in 2015 and 2016, but by 2018 the number of asylum seekers to the EU was back to 638,000, and only 38 percent of the requests were granted.2 This represents about one for every twenty-five hundred EU residents. That’s it. Hardly a deluge. "

― Abhijit V. Banerjee , Good Economics for Hard Times: Better Answers to Our Biggest Problems