How is this possible - why do jobs have to wait even if the system capacity exceeds the demand (i.e., even if utilization is below 100%)? https://hbr.org/2019/02/to-reduce-emergency-room-wait-times-tie-them-to-payments Group of answer choices If system utilization is less than 100% at any instant in time, then there should not be a queue at that instant. Demand sporadically "spikes" to exceed capacity for a bit of time, and then demand falls off below capacity for a bit of time (or more). This repeats itself. But on average demand is less than capacity, so on average utilization is less than 100%. If average patient demand is less than system capacity at any instant in time, there can still be a queue at that instant due to previous higher demand (a queue built up when there was higher demand and the queue has not yet been fully worked-off). All the other answers are correct