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This admin does not have that book on hand, and I am not sure whether Ben has read it or not. Does de Soto say that "social contracts" don't actually exists?

No; the opposite! He relates that wagon parties of pioneers, mining camps, etc. in the frontier did have social contracts that were enforced by ostracism. The "extra-legal" part meant that the social contracts functioned in a milieu of de facto anarchy.

That's why I thought you'd like it.

Sounds more like actual contracts to me.