The amount of the shortage or surplus in the market for public transportation is $0
A price ceiling is the maximum amount mandated by a seller is allowed to charge for a product or service. Usually it is set by law.
Price ceilings are typically applied to staples such as food or energy products when such goods become unaffordable to regular consumers.
A price ceiling is generally a type of price control. Price ceilings can be advantageous in allowing essentials to be affordable, at least temporarily.
Economists always worry that price ceilings cause a deadweight loss to an economy which make it more inefficient.
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