This Article describes a new model of contract. In parallel contract, one party enters into a series of contracts with many similarly situated individuals on background terms that are presumptively identical. Parallel contracts depart from the classical model of contract in two fundamental ways. First, obligations are not robustly dyadic in that they are neither tailored to the two parties to a given agreement nor understood by those parties by way of communications with each other. Second, obligations are not fixed at a discrete moment of contract. Parallel contracts should be interpreted differently than agreements more consistent with the classic model; in particular, the obligations of the repeat contractor should be understood by ...