Every business needs copy paper and office products to keep them in operation all throughout the day. The workers in the office cannot afford to stop working when they run out of paper and office supplies. The business could grind to a halt, and they would not have any way to get going again until they go out to get more supplies.
The business that has a standing order for their supplies will have supplies coming in at all times. Also, they will have every chance to order more supplies if they believe they are going to run out in the future. The business can plan to always have supplies in stock, and they will have every chance to make sure that they are ordering only what they need.
The person who is trying to supply the office can change their orders at any time to make sure the office has exactly what is needed. There are many offices that need to change what they use to meet the needs of their staff, and the staff needs to know that they can find what they need in the supply closet. Ordering for the business is a simple matter of planning with the right vendor.