Implementing bus and other public transportation systems comes with a variety of both positive and negative externalities. One potential positive externality is associated with the increase in pedestrian-only spaces. Suppose that there is a $2 per-unit positive externality associated with these spaces. In the presence of this positive externality, the market below pedestrian-only spaces. There is a deadweight loss o v as a result. overprovides underprovides $0 $1 S $2 $4 $8 ...." $ 8 D 1 2 3 4 5 6 7 8 9 10 10