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Black markets only exist in developing nations.
Network Node
An individual electronic device in a network that can send, receive, or forward information.
Amplifies Signal
A process or device that increases the power, voltage, or current of a signal.
Derivative Action
In control systems, a feedback mechanism that is proportional to the rate of change of the error signal, used to predict and stabilize future system behavior.
Error Signal
A signal proportional to the difference between the actual output and the desired output.
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