As any salesperson knows, the key to closing a deal is to understand the needs of the customer and then craft a solution that meets those needs. However, in order to do this effectively, salespeople need to have a deep understanding of their product or service. Case studies can be an effective tool for increasing sales by providing this type of understanding. By reading about how other customers have used the product or service, salespeople can gain insights into how best to meet the needs of their own prospects. In addition, case studies can help to build trust with potential customers by providing them with real-world examples of how the product or service has helped others. As a result, investing in case studies can be a valuable way to increase sales.