Monopoly over a territory is required for credible protection against competitive poaching

Evidence

From the point of view of M1 only the first and third are acceptable outcomes; in other words, M1 can remain a credible guarantor only if he can ensure that M2 either cannot or will not compete. Were M1 to be threatened by M2, dissatisfied customers could jeopardize his reputation and destabilize his other relationships, such as with P2, whose interests are properly protected by M1 only so long as M2 does not back P1’s complaints. M1 must have the last word, must secure for himself a monopoly on protection, at least over a limited territory or set of transactions. — Diego Gambetta, The Sicilian Mafia The Business of…, 184

Categorization

• XREF: This is the analytic mechanism behind why Mafia families fight turf wars — maps directly onto Corleone family’s territorial claims and conflicts with the other New York families in the novel.