If the black market does not have the protection of the rule of law, that is because
a) the rule of law does not emerge spontaneously or naturally in all circumstances
b) some third party power (namely, the established gang/govt) prevents the development of the rule of law in the black market.
In either case, and I don't think there's a third, the rule of law is equivalent to the law of the established gang/govt, and no other exists.
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