So the minimum stuff you need to contribute to society?
A person with a very marginal income can function on their own. A person can hold a full time job and be intentionally homeless, or live out of their car, truckbed, rv trailer, ect. Living reasonably well like that can cost around $6,000/ year, something a person can earn working an average of 3 hours a week at minimum wage. Although this sort of thing is "dropping out of the system" to some extent and is almost illegal and requires a lot of lying to get by, but at a minimum, its supporting yourself, contributing to the economy, even paying whatever taxes you'd pay living like that. It's basically what this dude did
http://guide2homelessness.blogspot.com/ and I was impressed on how he did so well doing it.
Of course, that dude went through a lot of effort to present himself as very square and mainstream to get a job, despite living in his car for several years on end.
So, I'd suppose that way of living is about the minimum for a single lone person. Although, I'd suppose that living in a car or cargo trailer isn't exactly "stable" nor can you really raise a family or do other such luxurious things, but for a couple or a single person, it's doable and not at all difficult to achieve.
People get themselves in trouble simply when they decide to live beyond their means. They get a mortgage on an overvalued mcmansion, lease an expensive SUV, run through credit cards and skim by on the merit of having a paycheck all because they want to live the techno-bling lifestyle they see people on TV having. When all they are doing is sabotaging themselves and ultimately, the economy and society. I don't feel sorry for these types of people at all, because they should have understood the risks and tried to level their ambitions to their means. I'd probably blame these people for the recession and the massive problems it has created for everyone effected before I'd blame the "1%er elites.
I'd almost suggest a commune or somesuch arrangement where food, lodging and work are ensured, although I don't think these places accept just anybody and there are plenty of rules and restrictions as such.
One thing I really believe in, is educating people about how shit works in the real world during highschool and making it a primary focus. Nobody graduating high school really understands how leases, mortgages, interest, bank products or currency work. Let alone how to maintain their own vehicles, get a job, negotiate a raise, raise kids, sue and be sued and a million other life skills people are expected to know and are never taught. Instead they get some rudimentary classic academics aimed at preparing them for college and are thrust out expecting to do something besides go fail miserably and move back in with their parents.