Subject: Cognition
And finance. Sounds sort of like Dunning-Kruger. People who overestimate their financial situations and acumen correlate with lower cognitive ability, and therefore make poor financial decisions.

https://phys.org/news/2023-11-...

More specifically, he found that respondents scoring the highest on the cognitive tests were 22% more likely to fall into the category of realists, which Dawson describes as more objective about their financial prospects, than were those falling on the opposite end of the spectrum.