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Unit economics for subscription/business model (CAC, LTV, payback)

Creates a unit economics model with CAC, LTV, gross margin, and payback, including sensitivity analysis. Useful for growth planning and investor discussions.

Build a unit economics model for {business_name}.

Inputs:
- ARPU / pricing: {arpu_pricing}
- Gross margin assumptions: {gross_margin}
- Churn/retention: {churn_retention}
- CAC inputs (sales & marketing spend, new customers): {cac_inputs}
- Expansion revenue (optional): {expansion_revenue}
- Time horizon: {time_horizon}

Output:
1) CAC, LTV, LTV:CAC, payback period (show formulas).
2) Sensitivity table for churn, GM, and CAC.
3) Interpretation: what levers matter most.
4) Data gaps and how to improve measurement.

Keep it investor-ready but conservative.

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