If ? is the non-constant average arrival rate, and ? (or k? with multiple servers) is the average service rate, why does a queuing system not approach maximum efficiency when these two values are approximately the same?

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The Answer of If ? is the non-constant average arrival rate, and ? (or k? with multiple servers) is the average service rate, why does a queuing system not approach maximum efficiency when these two values are approximately the same?

If ? Is the Non-Constant Average Arrival Rate, and