@browncoat - The thing is, we live in society, so there's no escaping it whether or not you're poor. Expensive clothes might seem like a luxury but they might be a necessity in order to get or keep a job. A car might be as well. And sometimes groceries are more expensive for the working poor because they live in areas where there is no proper supermarket. So they either have to spend money to get to one, or spend money in more expensive convenient stores whenever they run out of milk.
That's on top of the fact that even the most thrifty of families struggles when the providers are working for minimum wage. It is simply not enough to sustain people.
And we all end up paying for it, because anyone who can't feed their children on their work week is going to end up costing taxpayers with benefits or health care or whatever else. It would make much more sense for them to get a decent wage in the first place.