Unlike an individual pizza parlor, the taxi fleet in a given city plays an important role in policy planning. Public transit planning takes taxi service into ac

Unlike an individual pizza parlor, the taxi fleet in a given city plays an important role in policy planning. Public transit planning takes taxi service into account, and taxis are barred in many locales from refusing medically necessary transportation. Taxis have obligations that go above and beyond those imposed on a generic livery provider, and as such governments might be reluctant to let a few livery providers outcompete taxis into extinction.