It's not okay to lie or mislead other people.
Jeff wants to sell his car and has found a buyer named Martin.
Jeff wants to convince Martin to buy the car.
Jeff explains what issues the car might have and drops the price to make the deal more attractive.
Jeff hides a lot of problems with the car from Martin and tells him it runs perfectly.
Martin buys the car for the reduced price and gets the issues serviced.
Martin buys the car and is furious when it breaks down the next day.