What are the two key metrics that businesses must focus on to achieve sustainable growth?

CAC (Customer Acquisition Cost) and LTV (Customer Lifetime Value) are the two most critical metrics for sustainable growth because they directly measure the efficiency and profitability of acquiring and retaining customers. A healthy business model requires LTV to be significantly higher than CAC, indicating that the value gained from a customer outweighs the cost of acquiring them. Focusing on these metrics allows businesses to optimize their marketing spend, improve customer retention strategies, and ensure long-term financial viability. Revenue and profits are important outcomes but don't provide the actionable insights into customer economics that CAC and LTV do. Market share and brand awareness are valuable for strategic positioning but don't directly quantify the financial health of customer relationships. Customer satisfaction and retention are crucial for LTV, but LTV itself is the financial manifestation of these efforts, making it a more comprehensive metric for growth.