This piece shows how a running total differs from a rate of change, with parcel...

https://www.novabookmarks.win/learn-how-running-totals-differ-from-rates-of-change-with-parcel-counts-a

This piece shows how a running total differs from a rate of change, with parcel counts as a real example. Check units, such as parcels per hour, and time windows, such as one shift or a full week, so you know what piled up and how fast it moved.