For those talking about causality going both ways, it’s likely less than you think.

There’s another study regarding ACEs (adverse childhood experiences) that found those with high aces and who had financial security had 1/3 of the mental illness rate of those without financial security.

It really is the stress of lacking financial security and everything that comes with that, that causes most of the mental illness described. Combine that with how scarcity lowers your cognitive ability by the equivalent of 13 IQ points (Mullainathan and shafir, study on the same farmers pre and post harvest), and you see how much short term and long term damage it can do.