There's a restaurant in New York where menu prices rise and fall based on demand just like the Stock Exchange!
The Exchange Bar & Grill in New York City is a unique restaurant in that menu prices aren't set in stone, but rather, they change based on how many people are asking for the same thing. The principle behind it is the same principle as a basic stock exchange: the more people want a stock (or an appetizer) the more that stock (or nachos) is worth; if less people want it, then it's cheaper.
The restaurant does this for all food and drink items, and they have a ticker tape menu with flashing prices showing what the current demand is. A glass of Guinness, for example, can cost as much as $8 or as little as $4 depending on how popular it is at the time.