So you implicitly suggest that all people share the same principles of life and moral values. It may be true for a small isolated group of people and your idea of ostracism and outlawry may actually work between them. But if you take some larger proportion of population and apply this principle among them you will see tensions arise and eventually you will end up with fractions denying and neglecting each other (if not fighting)... 
Probably. But if they have their own spaces, like minded people will gather. They may even decide to form coercive governments. But if decentralization is common, and people have learned to be independent, those will be pockets.
But what about economics? To sustain the achieved standard of life we need that tight hierarchical integration between people (ironically called division of labor) which most anarchists loathe as much as they are afraid of...
WHY??? Why must you push those big shiny buttons when I'm dead!! (J.k). I'm going to eat. Then I'm going to sleep. Then I'm going to celebrate my son's seventh birthday.
After that, I'm going to start writing. Economics actually led me to anarchy (agorism), and I can answer all of the questions you and crumbs and several others have posed in great detail. This is my obsession. I have written about three quarters of a book called "anarchy is not chaos", and it addresses most of this. Unfortunately, right now if my wife yelled "Kevin!" I might not realize she was talking to me, or about me for that matter. Don't get old. You lose the creativity of insomnia.