I mean, I definitely understand my own living costs. I have no support from anyone, nor any saved costs in the vein of other people doing groceries for me or the like.
As for the rest... I don't know. Part of me wants to just compare finances but that isn't easily done, plus obviously there's a lot of personal information involved in that. But like, my total expenses are about 1300 euros per month, and I'm living on my own - if you live with others, costs per individual should lower, because you only have to pay for things like heating and rent once (and renting twice the space rarely comes with twice the price tag). That comes out to, in the Netherlands, 23 hours per week work at minimum wage. And if you actually work that amount, you're in a sufficiently low income bracket to be entitled to about 500 euros per month in government benefits, which is where my own margin comes from (because, as I mentioned before, I don't have the capacity to work more - obviously, if you're working something like 33 hours per week, you've got that same margin without government benefits, still at minimum wage).
Honestly, to return to what I said earlier - based on my own financial situation and that of other people in my country (with the same laws governing their income, taxes, etc), a lot of people seem to have a ton of spending that isn't nearly as necessary as they believe it is. I would actually find it weird if that isn't the case in other countries as well.
But like, I'm also trying to understand, because right now, I just simply don't understand.