Except that the "consumers" that result from a lax immigration policy tend to be sub-minimum-wage laborers who send every spare cent back to the Old Country, consuming as little as possible here, except for that which is paid for by gummint/taxpayers.
That’s an oversimplification, I think. They have to eat, they need a place to sleep, and — get this — more and more states have been passing laws that give driving privileges to illegal aliens, too.