Question : Packet switching

Explain the flaw in the following logic: Packet switching requires control and address bits to be added to each packet. THis causes considerable overhead in packet switching. In circuit switching, a transparent circuit is established. No extra bits are needed. Therefore, there is no overhead in circuit switching. Because there is no overhead in circuit switching, line utilization must be more efficient than a packet switching.

Answer : Packet switching

This statement seems to contradict itself:

"Because there is no overhead in circuit switching, line utilization must be more efficient than a packet switching".