Why are markets not efficient when private decision makers are left alone due to a positive consumption externality?
A) The demand curve is in the wrong place, and society sees a surplus of goods.
B) The demand curve is in the right place, and society sees a surplus of goods.
C) The demand curve is in the wrong place, and society sees a shortage of goods.
D) The demand curve is in the right place, and society sees a shortage of goods.
