Trust covers both unobservable actions and undisclosed knowledge others hold

Evidence

I have so far, in defining one’s trust in others, talked of the significance of others’ unobservable actions for choosing one’s own course of action. But there is another important class of cases where trust, in the sense that I wish to use the term, comes into play. This is when others know something about themselves or the world which I do not, and when - what I ought to do depends on the extent of my ignorance of these matters. — Diego Gambetta, Trust - Making and Breaking Cooperative…, 795

Categorization

• XREF: The knowledge-based branch of trust (undisclosed information) directly matches Blindness’s central conceit: the sighted wife holds knowledge the blind lack, making trust a matter of information asymmetry.