[Besides the state,] only three alternative bases for order exist: force, exchange, and custom, and none of these are sufficient in the long-run. At some point new exigencies arise for which custom is inadequate; at some point to bargain about everything in exchange relations is inefficient and disintegrating; while force alone, as Parsons emphasized, will soon ‘deflate’. In the long-run normally taken for granted, but enforceable, rules are necessary to bind together strangers or semi-strangers.
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