but you either exchange money and get the food you want, always. Or it's out of stock, so you don't get the food but you keep your money, guaranteed. It's not

but you either exchange money and get the food you want, always. Or it's out of stock, so you don't get the food but you keep your money, guaranteed. It's not a good analogy. With an LLM you might ask for a pea, be parted with your money, and be given a watermelon.