Well no, my point was about where authority really comes from
There are multiple places and yes enforcement is certainly one of them.
Though there is also competency, coercion, resources, social pressure, friendlyness... Though I guess they can all be "enforcement" (Listen to me or else I'll stop helping)
I think it is more that enforcers are important because there will always be at least one person who will not follow along and can basically hold things up for everyone.
You might get 100 people to build a apartment, agree to it, have a formen, a boss, and have him in charge because everyone agrees they are the best... But if one person decides "No!" they will end up holding things up soo much that every worker will pick up a stone and toss it at his head killing him.
Enforcement is the final say so to speak.
Though remember even enforcement works like that. There is such a thing as "Military rebellions" and "Military Coups"
Though that is a more ideal situation. Another reason for enforcers is to do things very few people would agree with. As with your Mafia example (Sort of... Mafia is complicated given some of them arise due to disenfranchisement and racism in a society creating a need for protection... and slowly move away from that original point)
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Actually I might just not be in the right page. Right now I am trying to think through the controls of command.
Why would someone listen to someone? Why would they be enticed/obligated/forced to listen to someone? Is enforcement the only way?
But then, maybe enforcement is just a catchall for everything that COULD do that. What better enforcement is there then for the reward to rely on the conclusion?