Your comment has raised some interesting questions for me, would true freedom of movement would seem to undermine the traditional nation state and the will of its people?
At the very least it would massively change what it means to belong to a nation, it could largely erase that belonging.
It would be such a different world to live in, national identity is already a tough thing to quantify and reason about.
Also ideas (books, movies, even music...) can influence a country even more than immigrants. Unsurprisingly, heavy censorship is very common dictatorships.
It's interesting to look at what rich and poor countries import and export ideas, ranging from academic research, literature, art to popular movies...
Why ? Because that makes a lot of sense given the economic changes they're trying to make happen.
Yes. We live in a world were for wealthy people/orgs it's very easy and cheap to move money, products, raw material, energy, information and jobs across the world, travel for business and recreation, even obtain visas and relocate to poor countries (both legally or with small bribes).
This 8 categories list almost everything that moves in the world with only one exception: people relocating to rich countries. That's incredibly difficult in comparison.
Even if you have an advanced degree, good intentions, no criminal record, fluency in the local language, willingness to work even at lower salaries, you still need a company to do expensive paperwork to effectively authorize you to be there.
If this does not sounds unjust enough let's not forget that people do not choose to be born in a wealthy or poor country.
EDIT: The usual bunch of downvotes came in just after posting. Interesting.