> governments often tolerate because they don't see a threat to their power I would say it is often even opposite of it - black/grey markets help to stay in po

> governments often tolerate because they don't see a threat to their power I would say it is often even opposite of it - black/grey markets help to stay in power. When everybody is breaking some law, buying something [almost] illegally, everybody wants to stay quiet. And it helps [totalitarian] government a lot.