“There is an entire business sector that has mastered the concept of inventory management. At any time of day or night, this business sector can precisely tell you the value of their inventory 'to the penny.' They can tell you where it is located, when they got it and who they got it from.”
Be sure to scroll down ... four clues are there to help you get the right answer.
1) This business sector generally has multiple locations where their inventory is
managed, received, stored and transported.
2) The people responsible for keeping the inventory count have, on average, less than
a high school education.
3) The people responsible for keeping the inventory, on average, stay at their position
  less than one year.
4) The industry is widely known and widely used. You, yourself, are likely to have
  interacted with their inventory several times, just this week.