What entitles the market to exist?
by fiat, land can be owned.
The first land was obtained through war and conquest (from native american indians). Those who worked and produced wealth used it to purchase the land from the crown (or whatever gov't that did the conquering).
If you want to change this, you either must convince everybody (including existing land owners) that your system is better. Or, raise an army, and take it by force (as what was originally done to the native american indians).
Like you said, through our system of democracy, we _allow_ the markets to exist in a particular form. We _allow_ the government to administer force to protect the peoples' ownership of private property. None of this is a given, and pretending everyone has a moral imperative to participate in the market does not follow.
If people in a region decide, by democratic means, they want to change the way the market functions, there is nothing implying they should 'get out'. It is fully within their rights.