Final answer:
Customer relationship management (CRM) is the tool used by companies to identify the most valuable customers and cater to their needs effectively.
Step-by-step explanation:
The tool that allows companies to determine which customers are most valuable so they can react in a timely manner with products that closely match customer needs is Customer relationship management (CRM). CRM systems compile information from a range of different communication channels, including a company's website, telephone, email, live chat, marketing materials, and social media. This helps organizations learn more about their target audiences and how to best cater to their needs, thereby securing sales and fostering loyalty.