Hotel deals and traps: Suppose, aperson travels to Chicago, IL and books a room on the 37th floor at a hotel. The hotel room includessmall snack packets that are very expensive. Despite having access to an elevator, the person decides to buy and eat those food. comment on the person's demand characteristic.

This is similar to buying something from vending machines on-campus. Generally, the same products are way cheaper off-campus. We generally assume that rarity of a product and its price have a direct relation. In contrary, this exercise shall help you understand why availability and price move in the same direction many times.