Which of the following generate the type of externality previously described? Check all that apply. Charles has planted several trees in his backyard that increase the beauty of the neighborhood, especially during the fall foliage season. The local airport has doubled the number of runways, causing additional noise pollution for the surrounding residents. Your roommate, Juanita, has bought a puppy that barks all day while you are trying to study economics. A leading electronics manufacturer has discovered a new technology that dramatically improves the picture quality of plasma televisions. Firms of all brands have free access to this technology