Particularly for airports, prices for licensed taxies are usually regulated to be within a very narrow, predictable range. Opening up the Uber app, the estimated price for an UberX to SFO from my current location is $47.30, which is almost exactly what a taxi would be--$45-50 in this part of the city. Licensed taxis are, at least to some extent, a deliberately planned component of the public transportation infrastructure.

And as I about to post this, the price for UberX changed to $49.80. Thanks for the illustration, Uber.