> Ultimately, guaranteeing common trust between citizens is a fundamental role of the State.
I don’t think that really follows. Businesses credit bureaus and Dun & Bradstreet have been privately enabling trust between non-familiar parties for quite a long time. Various networks of merchants did the same in the Middle Ages.
> Businesses credit bureaus and Dun & Bradstreet have been privately enabling trust between non-familiar parties for quite a long time.
Under the supervision of the State (they are regulated and rely on the justice and police system to make things work).
> Various networks of merchants did the same in the Middle Ages.
They did, and because there was no State the amount of trust they could built was fairly limited compared to was has later been made possible by the development of modern states (the industrial revolution appearing in the UK has partly been attributed to the institutional framework that existed there early).
Private actors can, and do, and have always done, build their own makeshift trust network, but building a society-wide trust network is a key pillar of what makes modern states “States” (and it directly derives from the “monopoly of violence”).
Havala (https://it.m.wikipedia.org/wiki/Hawala) or other similar way to transfer money abroad are working over a net of trust, but without any state trust system.
I don’t think that really follows. Businesses credit bureaus and Dun & Bradstreet have been privately enabling trust between non-familiar parties for quite a long time. Various networks of merchants did the same in the Middle Ages.