The Law of Diminishing Marginal Utility is best shown by which of the following examples? Mary is happier after buying her fifth pair of shoes than she was after only four pairs. l|. Jessie uses a buy one, get one free deal on airline tickets, and so invites a friend to share the trip. \"I. Big Bill loves cheeseburgers but finds that the third burger did less to increase his happiness than the second burger did. I only r' \"I onl (' Y | and III F