There's definitely negative externalities. The original nation of the immigrant loses workers and consumers. Some workers in the host nation lost bargaining p

There's definitely negative externalities. The original nation of the immigrant loses workers and consumers. Some workers in the host nation lost bargaining power. There's lost efficiency as the newly arrived immigrants generally accept a worse job than they had back home (see all the immigrants with degrees working menial jobs). Free movement is a great idea, but it's essentially colonialism version 2. We take the best and brightest from developing nations and make them servants.