@ChrisMayLA6 This I think must surely be different for different countries. In sweden, the cost of immigrants living off welfare is far, far higher than ethnic swedes, also add to that the cost of crime and the cost of terrorist financing and terrorist financing.
Finally, there is no way to tell, to everyones great frustration, the state of the economy without decades of immigration.
Then there is the question of which kind of immigrants. One of the most wealthy and successful countries on
@ChrisMayLA6 the planet, switzerland, has very little immigration. And the immigration they do have was mainly from southern europe.
I think another case could be made that having european immigrants is far, far better for the economy than arabian or african ones.