Look at 'taxes' thisaway:
As a mutually-acceptable reward for acceptance of -- and gain from
alternative catallaxies
As the 'Costs' of mutually-agreed property and transaction framework rights.
My Democratic Agorism paper addresses these points.
As does David Friedman's property rights paper, which there is a link to:
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--*--<Tony>--*--
http://www.agora.demon.co.uk
http://maelstrom.stjohns.edu/archives/la-agora