Robert is the owner of an automobile manufacturing company. He calls for a board meeting and tells his directors that he wants to build a car that lets the users experience power and exhilaration. He tells them that the car must allow his users to soar from 0-60 mph in about 4 seconds. He also adds in that the price of the car must be affordable enough for anybody making a good salary. In accordance with the given scenario, Robert is trying to segment the market on the basis of ________.