1. Loss is mentioned a lot but not mentioned is linking the asymmetric movement of trust to the cognitive bias of loss aversion.
2. Aside from Putnam, another take worth mentioning is Steven M. R. Covey's The Speed of Trust which speaks to the link of trust to performance within organizations.
3. The interface, boundary or contract is a common method of encapsulating trust. For example, since ancient times people have used "silent trade" in which trade goods are placed in the open and left behind. This requires a significant but finite amount of trust, minimal amount of social cohesion and provides a great deal of communication.
1. https://en.wikipedia.org/wiki/Loss_aversion
2. https://www.goodreads.com/book/show/36076.The_Speed_of_Trust