Trust extends beyond what written contracts can enforce

Evidence

It is important to realize that when Sam Goldwyn remarked that a verbal contract is not worth the paper it is written on, he was only half right, and that all that is interesting in the concept of trust lies precisely in that half which was In defining trust I have spoken of one’s expectations regarding others’ choice of actions that have a bearing on one’s own choice of action. — Diego Gambetta, Trust - Making and Breaking Cooperative…, 801

Categorization

• XREF: connects to: Custom fills gaps but must never contradict express contract terms — Henry M. Hart, Jr. and Albert M. Sacks, The Legal Process: Basic Problems in…, 888