Earlier quoted context omitted.
Only for fungible labor. Many skilled positions have scarcity, and employers are willing to pay more for an immigrant if their skillset is a better fit and/or can fill the position immediately.
>Only for fungible labor. Oh come now. All of us are fungible. None of us are irreplaceable (at least not to our employers.)
Can a janitor do your job? No? Then your labor is not fungible.
Can you do a janitor's job? Yes? Then that's fungible labor.
Most blue collar labor is fungible - meaning that just about any person who is not incapacitated can do it.