The document discusses 5 major forces placing pressure on companies: customer retention, shift to service-based differentiation, one-to-one marketing, expanded product diversity, and power shifting to customers. It emphasizes the importance of understanding customer costs, profitability, and lifetime value in order to prioritize high-value customers and make strategic marketing decisions. Customer lifetime value (CLV) treats each customer as an investment and focuses on the long-term profit stream from customers, helping companies evaluate marketing ROI and target attractive new customers.