  This paper describes the impact on transportation network companies (TNCs) of
the imposition of a congestion charge and a driver minimum wage. The impact is
assessed using a market equilibrium model to calculate the changes in the
number of passenger trips and trip fare, number of drivers employed, the TNC
platform profit, the number of TNC vehicles, and city revenue. Two charges are
considered: (a) a charge per TNC trip similar to an excise tax, and (b) a
charge per vehicle operating hour (whether or not it has a passenger) similar
to a road tax. Both charges reduce the number of TNC trips, but this reduction
is limited by the wage floor, and the number of TNC vehicles reduced is not
significant. The time-based charge is preferable to the trip-based charge
since, by penalizing idle vehicle time, the former increases vehicle occupancy.
In a case study for San Francisco, the time-based charge is found to be Pareto
superior to the trip-based charge as it yields higher passenger surplus, higher
platform profits, and higher tax revenue for the city.
