The irony here: Some people see studies like this and think, wow, think of how much we'd lose if we didnt let in immigrants. Our economy would be smaller, we'd have fewer jobs, etc. Other people see studies like this and think, wow, only us locals should own, run, and be employed by these Billion-Dollar Startups. Bannon has explicitly noted this as a goal!
Discriminating on nationality (which most had zero choice in, and was decided for them at birth) is the same as discriminating based on skin color or biological sex. It's just standard anticompetitive in-group/out-group fear-driven nonsense.