It feels like I must have glossed over it before, but flipping through the annotations in Ann Coulter's ¡Adios America! I'm not finding any references to it. I figure that if I'd find it anywhere, it'd be there.
The seemingly obvious thought just occurred to me that if the number of illegal immigrants in the US is significantly underestimated by the Census' Current Population Survey, to the tune of several million--with some estimates asserting that it is underestimated by nearly 20 million people--then the purchasing power parity (PPP) figures for United States will be correspondingly overstated.
Per capita purchasing power parity--a measure of monetary standard-of-living that is designed to allow for comparisons to be made between different countries--is calculated by dividing GDP as measured in purchasing power parity by population size. The CIA factbook puts US PPP at $56,300 for 2015. If there are 20 million unaccounted for illegals here, however, that figure drops to $52,640.
There is, then, an obvious incentive for the federal government to low-ball estimates for the number of illegal immigrants--and unaccounted for people more generally--in the country to make income and purchasing power statistics look better than they actually are.
Am I missing something here?