But what happens when these immigrants grow old? The UK House of Lords select committee noted this problem in their report on the economic impact of immigration. http://www.publications.parliament.uk/pa/ld200708/ldselect/ldeconaf/82/82.pdf

Also, Robert Reich writes in the Wall Street Journal there is insufficient demand to support a vigorous recovery. As Half Sigma notes:

“It’s actually quite easy to see how we can get a vigorous recovery. If the economy isn’t creating enough jobs to cover the growth of the U.S. population, all we need to do is stop the U.S. population from growing, which can easily be done by cutting off immigration, because nearly all of the growth in the U.S. population comes from immigration.

Why is Robert Reich so blind to this simple solution? That’s a rhetorical question, because here is the answer: It’s racist to be opposed to unlimited immigration, and because a racist is the most evil type of person in the entire world, cutting off immigration is an entirely unacceptable solution to the problem of five to eight years of unemployment, and to suggest it would condemn his immortal soul to hell. “

It’s actually quite easy to see how we can get a vigorous recovery. If the economy isn’t creating enough jobs to cover the growth of the U.S. population, all we need to do is stop the U.S. population from growing, which can easily be done by cutting off immigration, because nearly all of the growth in the U.S. population comes from immigration.

Why is Robert Reich so blind to this simple solution? That’s a rhetorical question, because here is the answer: It’s racist to be opposed to unlimited immigration, and because a racist is the most evil type of person in the entire world, cutting off immigration is an entirely unacceptable solution to the problem of five to eight years of unemployment, and to suggest it would condemn his immortal soul to hell.”

http://www.halfsigma.com/2010/04/why-we-are-doomed-to-five-to-eight-years-of-unemployment.html