Theory 197/Elevator scheduling/Threshold lens
Bunching Needs a Demand Threshold
The claim
Elevator bunching occurs above a threshold in demand, where cars cluster and service degrades abruptly.
01Mechanism
Cars that fall behind collect more passengers and fall further behind; the threshold marks where the feedback dominates.
02Prediction
Bunching should appear above a demand threshold.
03Refutation
Bunching increasing smoothly with demand would remove the feedback.