Question: Indicate whether the following activities create a positive or negative externality:
a. Late-night road construction begins on a new bridge. As a consequence, traffic is rerouted past your house while the construction takes place.
b. An excavating company pollutes a local stream with acid rock.
c. A homeowner whose property backs up on a city park enjoys the sound of kids playing soccer.
d. A student uses her cell phone discreetly during class.
e. You and your friends volunteer to plant wildflowers along the local highway.