Why did Edison's carbon microphone quickly become the standard for telephony over Bell's original design?

Answer

It produced a much larger, more powerful fluctuation in current.

Edison’s carbon microphone produced an output signal strong enough to be sent across miles of wire because the resistance variation caused a much larger fluctuation in the current than Bell's weak electromagnetic vibrations.

Why did Edison's carbon microphone quickly become the standard for telephony over Bell's original design?
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