If it’s you using a gun, you get Somalia. If it’s the police using a gun, you get the US. (If it’s the police using a baton, you get the UK). It works because the threat isn’t just physical harm but also social consequences. Even going back through history, there would be governmental consequences for not abiding by fair trade, whether that was the local lord throwing you in the stockades or the rest of your tribe ostracizing you.