As you probably know eBay is a company that creates a auction market for individuals trying to sell any item that they may possess. This allows the creation of an after-market for new and used computers. For example vou can find new, old, and refurbished Dell, Lenovo, or Apple computers. Some older models are more popular than others due to factors such as their perceived design, power of the computer, or upgradability. If you are purchasing a computer but want to find out the possible future value of the computer to sell later on, which task are you performing?