ISTR some anthropology class where they discussed a “farmer’s mentality” or something like that. In some older societies, people were afraid of letting others know about their wealth because:
- their jealous neighbors might give them an evil-eye
- people might want to steal from them
There might be other issues such as drawing the attention of the local tax assessor, but the lecturer spent most of his time discussing the fear of having someone put a curse on you. It extended past money to include keeping attractive daughters out of sight and being ambiguous about how many livestock you had. Weird. But it seems to make some sense. Maybe it’s just that heritage. I didn’t know that this isn’t the case in some other countries. I wonder what that’s all about.
My personal experience: I’ve had people become quite upset when they find out how much money I make, and I in turn have gotten pretty upset when I found out other peoples’ salaries. Since so much of life is hard to judge quantitatively, and money is easy to count, people judge their and others’ lives by their wealth because it’s just a simple set of numbers, even though it’s often uncorrelated with how well a person’s life is really going.
Anyway, quit sticking your nose in other peoples’ business. 
My goal before she leaves this house is that she will understand money.