a promise 2. In this case this is a unilateral contract since it is a poonise to a goup of poeple who sign up lar the comperition. 3. Yes Marcel Motors had made a promise to a larger group of people which is in tact a unlateral contract and by res aing to anad the a.tomokle they an latil fo a lanstist. 4. I dont believe its ethical thery broke a promise they made to everyone bocasue they thought a wouldht happen.