The diagram below shows the marginal cost of pollution abatement for two firms,Firm X and Firm Y. 
FIGURE 17-4
-Refer to Figure 17-4.The optimal amount of pollution abatement for these two firms together is
Definitions:
Pilot Device
An interface component used to control and monitor the operation of machinery or equipment, often initiating the start or stop commands.
Control Coil
The coil in a relay or contactor that, when energized, creates a magnetic field to pull in contacts, controlling circuit continuity.
Differential Switches
Devices designed to protect electrical circuits by automatically interrupting the current flow when detecting an imbalance between the incoming and outgoing current.
Pilot Devices
Controls, such as buttons and switches, used to operate machinery or equipment indirectly.
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