I understand that reducing productivity costs will increase productivity, so unlimited immigration would make GDP go up. (And GDP does not factor in the costs of supporting increased numbers of unemployed people.) But this, from the study, strikes me as pure hand-waving:

>Moreover, immigrants are often imperfect substitutes for native-born workers in U.S. labor markets. That means they do not compete for the same jobs and put minimal downward pressure on natives’ wages.

For the statement "they do not compete for the same jobs" to be even partially true, you would have to show me at least one job in the US that only immigrants do, and no natives do. It certainly would not be construction, or landscaping, or custodial work.

A flood of low-skilled, low-educated immigrants would benefit people like me, who they do not compete with for jobs, because it would make the services they provide cheaper for me.

But as you acknowledged, it does hurt the people whom they DO compete with, and I would argue that extends beyond blacks and teenagers, although that alone is enough for me.

Roughly half of the working population in the US has an IQ of 100 or below. These are the people upon whose well-being, I, personally, place a far higher priority than similar people who are currently not US citizens. That is what my position is premised upon. I am willing to forgo the extra GDP and cheaper lawncare so that their lives might be a little less difficult than they currently are.