That cashier analogy seems quite bad. You're looking for an example of cooperative multitasking and you're taking customers waiting in a line, the least coopera

That cashier analogy seems quite bad. You're looking for an example of cooperative multitasking and you're taking customers waiting in a line, the least cooperative group of people in the world? Also, I have never seen a store setup where a cashier is shared between two lines and is handling the other line while they are waiting for your payment to go through. I feel like car sharing services are a better analogy. If you're not using the car, someone else can.