This "can't cover a $400 expense" makes for a nice narrative, and we can all insert our perspectives about the world into this narrative, and walk away feeling good about it.
Quotes from the above twitter thread:
> I was curious about this because it seemed low. After some digging I found the 2016 appendix (again, 2017 not to be found). Only 12% of people couldn't actually pay the expense and a smaller amount would have to borrow money (keep in mind this could be double counted)
Another survey question not highlighted actually gives some direct clarity on this question. It turns out only about 15% of people would not be able to cover a $400 expense.
update: clarify uses of "this" and "it".