Are those numbers suspect because of the source, or because you know better?
On the ground here in SAC I have no reason to doubt them, or verify.
I always trust but verify. :-)
I also suspect that the newspaper, if not the authors of the research, are conflating wealth and income.
I posted a link to the 42 page paper. Folk can read it and see what they think. I find it very telling that the LAT didn’t provide a link to the paper.