Because contrived interdependencies of this nature are not expected, to bring them about requires open communication about them between the people concerned, and this, as we have suggested, may introduce a climate unfavourable to trust into the relationship. … The situation is different when such interdependencies already exist and can be presumed to be known, when the participants are living in a system which is familiar to both of them, so no further information about it is required, since it tacitly provides an everyday basis for mutual understanding.

Niklas Luhmann, Trust and Power, loc. 179