Because I have a basic understanding of supply and demand. I even explained how supply of labor was being distorted in my post at both the higher and lower ends of the job market. I think the more appropriate question is how do you not know?
Labor economists have concluded that undocumented workers have lowered the wages of U.S. adults without a high-school diploma — 25 million of them — by anywhere between 0.4 to 7.4 percent.
