Anarchy is simply the lack of a ruling body and law enforcement. In a utopian society, it is a viable way of life, as it is not unimaginable to have communities of autonomous families, often helping each other in an unofficial, non-mandatory cooperation. Technology could be shared, and resources could be traded. Civilization could exist. The communities may even elect representatives to negotiate on their behalf with neighbouring peoples. They may found institutions and start a society resembling our own, and it will stay anarchy as long as there is no official code of law pertaining to the subjects of this community.
Plop this idea onto reality and it falls right into pieces.
Plop this idea onto reality and it falls right into pieces.