Skilled Labour.
The benefits of having foreigners is that amongst the pool of migrants there will be skilled workers, doctors, engineers, scientists, etc. Even those who will work in construction may have skills lost to the home market, nurses who will work hours and conditions that ours will not.
All the dirty jobs will be done, office cleaning, toilets, rubbish collection. These foreigners will get the bad housing, that we don’t want and they will buy second hand goods, such luxury cars that we would not bother with. 2 Samuel 5:11, 1 Kings 5:1-18, 9:27, 10:11, 22, 1 Chronicles 14:1.
King Solomon hired foreigners from Lebanon to build the Jewish Temple in Jerusalem. This is a good example of allowing people to travel from country to country. Just because we think we can go to the Gulf and get the best jobs, the Arabs think by our lifestyle we are load of whores, drunks and criminals.
Ask me and I will tell you! 