The former term is more common in postal rate circles and the latter more common in economics.
The first term is used more in the postal rate terminology, the second in economics.
The former term is used only by economists, the second used only in postal rate circles.
a teacher is reading during recess
I think alcohol's a much more harmful drug, and it's completely accepted in our society despite that.
The boy is wearing a blue shirt.
Someone is cycling.
The man is sitting on a park bench.
He was eating large amounts of food at once.