The marginal or asymptotic cost of a trip would consist solely of the electricity required to lift the elevator payload, maintenance, and in one-way designs (such as Edwards'), the cost of the elevators.
The marginal or asymptotic cost of a trip would consist solely of the electricity. This electricity is required to lift the elevator payload, and in one-way designs (such as Edwards'). The electricity required to lift the elevator payload, and in one. Way designs (such as Edwards') are the cost of the elevators. The elevator payload is maintenance.