I'm only thinking of that as ultimate last resort though. Not something commonly applied. If you think about what life would be like for someone who chose not to follow their obligations, who actually murdered someone, they would be pretty much akin to an outlaw. Think about the way a business gets treated now, if say the owner advocates a homophobic or racist position. They are generally pretty quick to retract. In a free market, reputation matters. Who would want a reputation as a racist or a homophobe much less a murderer? I guess that's what I'm trying to say. It would be for very rare extreme cases. Like say a unabomber or the like, someone living in the woods and not having to depend on the market.