Being dishonest is wrong.
Ed is a used care salesman at at local dealership.
Ed wants to best his monthly quota by selling one more vehicle.
Ed points out that the car is not a very good option and shows the buyer a more reliable vehicle that meets his requirements.
Ed misrepresents a car's maintenance history  in order to make a sale.
The buyer is happy with his choice and decides to rely on Ed for his future car shopping.
The buyer faces a big repair bill when the car breaks down during his first week of ownership.