Each week I assign some reading or video. Recently I assigned a series of videos where Bryan Caplan discusses common biases, including the anti-foreign bias
One student questioned the benefits of expanded immigration, wondering if the costs to American workers might be too great. Below is my response:
My understanding of the evidence is that immigrants to the US are almost always complementary to US labor (e.g. Indian doctors that keep American designers healthy, or Salvadorian cooks who feed American engineers). The area where your suspicion is true (again, based on my limited understanding of the data) is with high school dropouts.
High school dropouts face competition from immigrants (who are often unable to apply their skills due to regulations or attempts to avoid being caught by immigration authorities) because relatively low-skilled immigrants face similar disadvantages in labor markets (i.e. they have a similar comparative advantage but their alternative options are even worse).