In: Economics
Solution:
The optimal ticket price can be found where the market forces of demand and supply equate (or the market demand curve intersects market supply curve in the market of transit services). In this sense, the quantity of transit services that is demanded by the consumers at a particular price, is being exactly provided for or supplied for at that price.
This is efficient because due to this equivalence in quantities demanded and supplied for a common price, there is no deadweight loss produced.