Okay, yes, Uber can be replaced by a taxi service with a good app because Uber's a taxi service with a good app. Gold star. A taxi service is an essential comp

Okay, yes, Uber can be replaced by a taxi service with a good app because Uber's a taxi service with a good app. Gold star. A taxi service is an essential complement to mass transit, and Uber provides that service in areas with poor taxi service (essentially everywhere).