Harvey’s Car Lot bought a used car from Luke. When Luke delivered the car, Harvey gave him a cheque for $5000. Luke cashed the cheque immediately. When Harvey put the car in the garage, he discovered that the bottom was severely rusted and the engine was shot. What can Harvey do about the cheque? How should Harvey change his purchasing practices? How would the outcome be different if instead of giving Luke a cheque, Harvey had promised to pay Luke when Harvey resold the car?