Trust, in the business sense of the word. https://en.m.wikipedia.org/wiki/Trust_(business) https://en.m.wikipedia.org/wiki/Trust_(business) In the days of Roc

Trust, in the business sense of the word. https://en.m.wikipedia.org/wiki/Trust_(business) https://en.m.wikipedia.org/wiki/Trust_(business) In the days of Rockefeller, these things were a little more formal. Nowadays companies know better than to put such silent agreements in writing.