system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] how much would being a wizard decrease cost of living, assuming you're competent at magic?

It seems like it'd be a pretty significant amount, but is it really? I've been thinking about this recently and it makes me wonder.
gpt
Almost entirely. 'Wizard poor' is nothing like muggle poor. Your cost of living is basically... a tiny amount of food. Then you can duplicate or grow it as much as you like. You can conjure flavouring for it - sauces and whatnot. You can conjure water or wine. You can clean and repair with a word. And there's no land tax, because wizards can create new *space* whenever they want, and live in said space. 

So the principle costs that we would regard as an essential cost of living would be travel and clothing, since conjuring clothing requires not just general knowledge but specific knowledge. For travel, you can purchase a broom and get just about anywhere for a single initial cost, or connect your home to the Floo network and pay for powder as you use it (which is cheap enough that the Weasleys can do so), or use the Knight Bus, all assuming you dislike casual use of apparation (or that there are places you need to go that you cannot apparate to). 

Now, of course, with magical living come some magical problems, some of which people will typically pay to have solved. Gnome infestations, various unwanted hauntings, etc. But that is comparable to the mundane problems that competent wizards can completely ignore, so it's neutral in the comparison.