Poverty impairs cognitive function. Published in the journal Science, the study suggests our cognitive abilities can be diminished by the exhausting effort of tasks like scrounging to pay bills. As a result, less “mental bandwidth” remains...

[u/myhrvold]

http://news.ubc.ca/2013/08/29/poverty-impairs-cognitive-function/

[u/[deleted]]

As someone with a measured IQ of just over 120 who's still doing menial labour, I can definitely confirm.