Actually there are good examples of market anarchy in Iceland during the middle ages (as David Friedman explains) and in the south of Asia for 300 hundred years. A anarchic society that lived, prospered and defended themselves from invarsors for 300 years... thats hardly the "inevitably collapse" that bonker is talking about. Most democracies dont last half that time.
There's medieval Ireland too, which stood for almost a thousand years with no concept of state justice.
I'm not aware of this Asian example. How was it called? Do you have a good text about it?