Answer:
dissonance
Step-by-step explanation:
Based on the information provided within the question it can be said that this attempt seemed to be aimed at reducing dissonance. This term refers to holds two or more contradictory beliefs, ideas, or values. Which in this scenario, the salesman makes this comment in order to see if Billy was satisfied and knew that his purchase was a good one. If Billy were to decide to sell the car to one of those interested buyers then it is likely because he does not know its value.