A free ride? Imagine you’re trying to hail a cab in New York City. You see one coming down the block, but someone runs out of a nearby building, flags it down, and opens the door before you do. They tell you they’re in a rush, but when they hear you’re going in the same direction and getting off earlier, they offer you to hop in for a free ride. The situation results in one of two possible outcomes: you get where you’re going for free, or this stranger lied to you, runs out of the car at a red light, and leaves you with the bill.