It goes a little further than “money for basic necessities”.

It’s about being able to provide the necessities AND having income security. I remember reading about a study that said poor people who have to scramble to deal with all of the extra steps that accompany being poor (no credit cards, maybe no bank account, dealing with getting utilities turned back on, etc) is the equivalent of losing about 15 IQ points from your optimal.

It’s the difference between being able to work “in the zone” / flow state frequently and being always stuck in “fight or flight” mode. One makes you successful while the other actively sabotages you.