Did I miss the part where they discuss the economics of having a larger worker pool? like how that would affect existing workers? that seems like an enormous question to not address fully.
It would not affect everyone equally, and wages in many areas would definitely go down. For example, if the US recognized medical degrees from other countries, the influx of doctors would be so large that the income for a physician would drop tremendously. So the physicians that are already employed should (if they represent their own interest) be very against such a policy. But the aggregate would end up being that…
We require them to go through a US residency.
Something like 1/4 of doctors in the US are foreign born.
http://www.nytimes.com/2010/08/12/health/12chen.html
https://www.theatlantic.com/health/archive/2017/02/the-value...
https://www.forbes.com/sites/nicolefisher/2016/07/12/25-of-d...