Dustin’s copy shop can use four alternative plants. The figure above shows the average total cost curves for Plant 1 (ATC1), Plant 2 (ATC2), Plant 3 (ATC3), and Plant 4 (ATC4). Dustin’s minimum efficient scale is

A) 2,650 copies per day.
B)  4,000 copies per day.
C) 6,000 copies per day.
D) More information is needed to determine the minimum efficient scale.


B)  4,000 copies per day.