Looking at best sellers regularly is just part of retail. What am I selling out of, and do I need more? However, anyone buying for a small retailer benefits significantly by understanding what classifications generate the most sales, which are seeing the greatest customer demand, which are making them the most money, and how much their customer wants to pay for something in that classification. The same approach is taken for weekly assessing Vendors. Knowing these metrics helps you understand your customer and better buy for them.