Customer Acquisition Cost (CAC) is a financial and marketing efficiency metric that measures the total cost incurred by a business to acquire a new customer over a specific period. It reflects the effectiveness and efficiency of sales and marketing investments in generating new customer relationships.
Formally, CAC can be defined as:
CAC = Total Sales and Marketing Costs / Number of New Customers Acquired
CAC is expressed as a per-customer monetary value and indicates how much a company spends to convert prospects into paying customers. A lower CAC suggests higher acquisition efficiency, while a higher CAC indicates increased cost pressure or reduced marketing effectiveness.
In strategic and financial analysis, CAC is a critical unit economics metric used to evaluate business scalability, profitability potential, and marketing performance. It is often analyzed alongside Customer Lifetime Value (CLV), retention rate, and average revenue per user (ARPU) to assess whether customer acquisition is economically sustainable.
A key strategic principle is that CLV should exceed CAC by a significant margin to ensure long-term profitability.
Thus, Customer Acquisition Cost is a foundational business metric that quantifies the investment required to grow the customer base, serving as a core indicator of marketing efficiency and growth sustainability.
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