Discussion
Which of the following is not a reason to add an emitter resistor?
To increase the stage's voltage gain
To stabilise the operating point against temperature
To make the gain depend on resistor values
To raise the stage's input impedance
Answer: A
Increasing the voltage gain is not among them - an unbypassed emitter resistor reduces the gain, and that reduction is precisely the price paid for the other three benefits. Bias stability, predictability and a higher input impedance all follow from the same local feedback. A component added for three good reasons usually costs something, and recognising which of the four listed effects runs the other way is the whole of this item. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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