The point is not the number of cars or trash bags. It is the incentive to use a vehicle or generate a bag of trash. If a $20/day charge is out of reach for the

The point is not the number of cars or trash bags. It is the incentive to use a vehicle or generate a bag of trash. If a $20/day charge is out of reach for the poor, 100% of the poor will avoid parking and take public transit. If $20/day is meaningless to someone that makes $500k/year, then they will not factor that into their decision to drive versus take public transit. So for those that set prices, does it matter whether demand elasticity is equal across income levels or not?