How is inventory like water flowing into and out of a bathtub? How do you relate the bathtub model to the inventory balancing equation [e.g., Ending Inventory = Beginning Inventory + Purchases (flow in) - Inventory Sold or Used (flow out)]? How do you measure how much inventory has been used during a specific time period-say, a year? Why is knowing Inventory Turns an important measure of the inventory asset? Be sure to make a good argument for your position.