Before revision:  These impacts are assessed by a market equilibrium model that captures the incentives of the passengers, drivers , and the platform, and accounts for the congestion externalities of the TNC vehicles. Under a wage floor on TNC drivers, we consider two schemes of congestion surcharges : (a) surcharge based on each TNC trip , and (b) surcharge based on each vehicle hour (regardless of whether the vehicle has a passenger or not) .
After revision:  These impacts are assessed by a market equilibrium model that captures the incentives of the passengers, drivers , and city revenue. Two charges are considered : (a) surcharge based on each TNC trip , and (b) surcharge based on each vehicle hour (regardless of whether the vehicle has a passenger or not) .