Dr. Herbener,
What if the assumption of immigrants producing more than they consume is not true? For example, a poor immigrant working under the table making less than minimum wage might quite possibly be receiving (and likely consuming) welfare and other government entitlements well in excess of what they earn in their under the table job.
Whether or not this is the case for most immigrants, I believe this is what most anti-immigration critics have in mind. The very poor worker who utilizes the generous welfare programs of developed nations and ends up consuming more than they produce.
