Unit Economics Explained: CAC, LTV, Burn Rate & Growth Efficiency
Revenue growth can look impressive on the surface. However, if each customer acquired costs more than the revenue they generate, expansion becomes dangerous rather than profitable. Unit economics provides clarity by analyzing profitability at the customer level.
Understanding Customer Acquisition Cost (CAC)
CAC measures how much a company spends to acquire one new customer. It includes marketing expenses, sales salaries, advertising costs, and software tools used for acquisition.
Total Marketing & Sales Spend ÷ Number of New Customers Acquired
If CAC rises faster than revenue growth, the business model becomes inefficient.
Lifetime Value (LTV)
LTV represents the total revenue a customer generates during their relationship with the company.
Average Revenue per User × Gross Margin × Customer Lifespan
A strong business maintains an LTV to CAC ratio of at least 3:1. Anything below 1:1 indicates loss-making acquisition.
Burn Rate & Runway
Burn rate measures how quickly a company spends cash reserves. Runway shows how many months remain before additional funding is required.
| Metric | Definition | Why It Matters |
|---|---|---|
| Gross Burn | Total monthly expenses | Indicates spending level |
| Net Burn | Monthly loss after revenue | Shows actual capital consumption |
| Runway | Cash ÷ Net Burn | Determines survival period |
Scenario Analysis
Suppose a company spends ₹12,00,000 per month on acquisition and gains 600 customers. CAC becomes ₹2,000. If average LTV is ₹7,000, the LTV:CAC ratio is 3.5:1 — indicating sustainable growth.
Strategic Mistakes to Avoid
- Scaling marketing before improving retention
- Ignoring churn when calculating LTV
- Overestimating lifetime duration
- Expanding without runway analysis
Building a Sustainable Growth Engine
Unit economics is not just a finance metric. It directly influences pricing strategy, acquisition channels, and long-term scalability. Businesses that understand their customer-level profitability make smarter expansion decisions.
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