Yale law professor Ian Ayres continues his American Contract Law course with a case study on indefinite, incomplete, and deferred contract terms. He walks through Dixon v. Wells Fargo, a dispute over an unfulfilled mortgage modification agreement, using it to test how courts handle contracts that leave key terms open or unresolved. Ayres breaks down the bargain relationship at issue, asking whether a lender's promise to modify a loan can bind it when specifics were never pinned down. The lecture is part of his Coursera-linked series on American Contract Law, and points viewers to the underlying case file for closer reading. Short and focused, it treats the case as a vehicle for the broader doctrinal question of when incomplete terms still create enforceable obligations.