Add that debt networks can establish reputation

contents/english/4-3-commerce-and-trust.md

@@ -124,7 +124,9 @@ Nor is the role of money as a solvent in socially long-distance trust particular
 
 [^TTC]: Alvin E. Roth, Tayfun Sönmez and M. Utku Ünver, "Kidney Exchange", _Quarterly Journal of Economics_ 119, no. 2 (2004): 457-488.
 
-Similarly, as we noted in the [Identity and Personhood](https://www.plurality.net/v/chapters/4-1/eng/?mode=dark) chapter, it may once have been necessary to offer someone in a distant land a widely valued token, such as gold, instead of a promise to offer a gift in the future, given the low likelihood of a future exchange. Yet such shorthand is far less important today: with everyone within six degrees of social separation and the accounting for relational trust computationally trivial, today it would be almost as easy to harness interpersonal "debts" in chains of relationships directly as to transfer funds.
+Similarly, as we noted in the [Identity and Personhood](https://www.plurality.net/v/chapters/4-1/eng/?mode=dark) chapter, it may once have been necessary to offer someone in a distant land a widely valued token, such as gold, instead of a promise to offer a gift in the future, given the low likelihood of a future exchange. Yet such shorthand is far less important today: with everyone within six degrees of social separation and the accounting for relational trust computationally trivial, today it would be almost as easy to harness interpersonal "debts" in chains of relationships directly as to transfer funds. This network of debts can also be used to calculate others' reputation[^TrustIsRisk].
+
+[^TrustIsRisk]: Orfeas Stefanos Thyfronitis Litos and Dionysis Zindros, "Trust Is Risk: A Decentralized Financial Trust Platform" _Financial Cryptography_ (2017): 340-356
 
 A natural question is whether harnessing these new capabilities adds anything meaningful. While we will reserve a detailed discussion of applications of ⿻ commerce and trust to the [next part of this book](https://www.plurality.net/v/chapters/5-7/eng/?mode=dark), it is not hard to imagine why such information is important in appropriately allocating the trust and influence that money confers. Someone who has conferred many small benefits across a local community, but interacted little outside of it, and is single has a very different profile of appropriate social favor than someone who is deeply devoted to their family and profession but has few extra-familial social connections in a large city. These two may deserve the same "degree" of social esteem (if quantifying such is even useful), but the esteem is of very different kinds. The former, for example, would be a far more plausible civic or political leader in her community, while the latter would naturally be entitled to professional esteem and a degree of material comfort.