Answer
The steering wheel lock would make it harder for car thieves to break into a car, but then, the thieves would possibly get into car accidents with other people (which is negative). Thus, the steering wheel lock is a negative externality.
Work Step by Step
The tracking system doesn't defer car thieves from breaking into a car, but other car owners would not be affected by the theft. Thus, the tracking system is a positive externality. There could possibly be policy implications since policies could be made to think about the externalities of the different way to protect a car from theft.
