I've always thought that when people say that, they mean "complicated" things like APR on loans, or deductions on their payslips, etc.
But a couple of recent conversations have really got me thinking..
First one, a middle aged semi-professional bloke. We started talking about business finances, tax returns, etc., and he just glibly said "I don't understand money" so I'll need someone to do all that for me. Fair enough, pretty common for the self employed to engage an accountant and/or book-keeper. I started to prod away at what he'd do himself (usually invoicing customers, paying bills, etc), but he didn't want to do any of that. I showed him a couple of very basic templates for a sales invoice - literally just putting in a bit of text in one column, the price in the next column, then add things to it line by line. His face just went blank and he said he didn't understand invoices. I tried to say it was just the same as the invoice he'd get from a garage for his car repair, or from a tradesman working on his house, but he just didn't "get in". I started talking about bank statements and he said he never looks at them because he doesn't understand them!
Really struggling here to know how someone "can't understand" a bank statement. It's just a list of in's and out's and a running balance as to how much is in the account. Fair enough, sometimes credit card statements, loan statements etc can be hard to understand, but this was a simple current account statement. He just glazed over and repeated "I don't understand money".
I thought it could be a numeracy problem/disorder, so I left it, and we started talking about other aspects, and he was perfectly capable of understanding and dealing with numbers when it came to talking about, say, engineering terms, of nut and bolt sizes, lengths and dimensions. It really was just a complete mental block about money.
Not sure what I'm asking really.
As I say, I've seen this twice recently, after never experienced it at all in the previous 40 years of working. Yes, I've come across a fair number of innumerate and illiterate people and worked with them to support them as best I can, but really never had this "blindness" about money before from people who are otherwise functionally numerate and literate.