[...much snip...] But I doubt that we can have a world without government, and it seems that the more dense the population (such as in BIG cities), the more needs there are for a variety of government services.  There does not seem to be enough land for each person to have self-sustainability and voluntariness without attempting to account for various public goods, whether we are talking about roads or air and water or even questions about access to property that could be classified as either public or private depending on the structure - and I question whether removing government even resolves property rights and access matters.