It's not that just about having an inherent distrust of one another. When they do have a dispute, it is necessary to have very good documentation to bring to co

It's not that just about having an inherent distrust of one another. When they do have a dispute, it is necessary to have very good documentation to bring to court. Legally doing a mediocre job with keeping records is barely better than not keeping records at all. So they end up spending a lot to mind their p's and q's, even though they do have a good amount of trust. With a blockchain it becomes cheap to add a layer of ex-post verifiable mutual agreement between mostly-trusted parties.