Hmm, I see I did not answer your question properly.
In my neighborhood, the only fixed costs are taxes for our individually owned property. The rest is up to you. If you want electricity, you have to build that infrastructure for yourself. Some residents therefore have huge power systems, while others are content to have none at all.
We do jointly maintain a common road: those that have money contribute to purchase of gravel. Those that do not have money or choose not to spend it offer their labor.
In the past, the neighborhood has worked as a group on financial ventures: the above mentioned fair, one guy started a tree-planting business that hired neighborhood folks, another resident is a painter and hires neighborhood folks (I worked for him one year, my husband worked for him as well at a different time).
A few residents drive to town daily to work 'regular' jobs. Most don't, as the living expenses are so low that you can work on seasonal projects to generate enough income for the entire year.
This works because we each own our own place, and mind our own businesses. We do have weekly volleyball games, monthly potlucks, we work on each other's properties for work parties (building our pond, fixing a bridge, painting benches for the volleyball court area). We also have lots of parties, and neighbors constantly visit each other. There is very little turnover of residents; and we have several three generation properties. Lots of babies!

We have Christians, Buddhists, atheists, and others, we have poor and well-off, vegans and carnivores, hippies and democrats and republicans, and we have several ethnic groups represented...
I guess it is more like a bizarre Mayberry than a intentional community- that is probably why it works so well and has lasted so long.