This article describes the life of a man who has taken the 100 Thing Challenge to the extreme. He stopped using money in the year 2000, & has been living alone in a cave outside of Moab, Utah. His story is reminiscent of that of Chris McCandless, who decided to echew societal norms to live alone in the Alaskan tundra. However, you will recall that that guy died of starvation in the end.
Now, I'm all for reducing material possessions, as you can see from my previous posts on the 100 Thing Challenge. But I'm not sure I'd want to live without money if it means living in a cave by myself. Humans are social creatures. To be healthy, we need to be in contact with other people, & in order to live in a community we need to be able to accept the basic norms of social living. Money is definitely one of them.