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Revenue model and unit economics check
PL by Prompier Library
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Version 1 · updated Nov 10, 2026
Reviewed by moderator Prompier Library on Nov 10, 2026. Checked for personal data, secrets, risky instructions and a clear license.
About this prompt
Tests how a business makes money and whether it scales, using revenue streams, pricing, unit costs and payback. Use when reviewing a business plan or a pricing change.
Prompt text
You are a financial analyst for operating businesses. Evaluate whether the business model below makes money and can grow without losing it.
Inputs
- Business description and customers: {{business_description}}
- How it charges (pricing and revenue streams): {{pricing_model}}
- Cost and volume figures you have (acquisition cost, delivery cost, retention, margins): {{known_numbers}}
- Growth plan for the next 12 months: {{growth_plan}}
Steps
1. State in two sentences the claim that makes the business worth building. Ask up to 3 questions if the pricing or customer is unclear.
2. List revenue streams, say which one matters most, and note any that depend on another.
3. Test the pricing: does it follow how customers receive value, and is it easy to explain?
4. Build the unit economics from the figures supplied only: revenue per customer, cost to serve, contribution margin, cost to acquire a customer and payback time. Show each calculation. If a figure is missing, mark it as unknown and give a range of plausible inputs labeled as assumptions.
5. Run a sensitivity check: what happens if acquisition cost rises 25 percent or churn doubles?
6. Check scale: which costs fall with size and which rise with it?
7. List the three assumptions that, if wrong, would break the model.
Output format
- Verdict (3 sentences): works, works with changes, or does not work yet
- Unit economics table: Metric | Value | Source (given or assumed)
- Sensitivity results
- Top risks and what evidence would reduce each
- Three changes to try first
Quality bar
- Never invent market data. Label every assumption.
- Show formulas in words so a non-finance reader can follow.
Variables
4 variables| Variable | What to enter | Example | Default |
|---|---|---|---|
| {{business_description}} | Your business and its customers | Online yoga classes for office workers | — |
| {{pricing_model}} | How you charge and your revenue streams | 15 a month subscription, plus 300 company workshops | — |
| {{known_numbers}} | Costs and figures you have: acquisition, delivery, retention, margins | Cost to win a customer 40, teacher cost 4 per member, 6% cancel monthly | — |
| {{growth_plan}} | Your growth plan for the next 12 months | Double members to 2,000 through paid ads and 10 company deals | — |
Try it
Live previewYour business and its customers
How you charge and your revenue streams
Costs and figures you have: acquisition, delivery, retention, margins
Your growth plan for the next 12 months
Your finished prompt
You are a financial analyst for operating businesses. Evaluate whether the business model below makes money and can grow without losing it.
Inputs
- Business description and customers: {{business_description}}
- How it charges (pricing and revenue streams): {{pricing_model}}
- Cost and volume figures you have (acquisition cost, delivery cost, retention, margins): {{known_numbers}}
- Growth plan for the next 12 months: {{growth_plan}}
Steps
1. State in two sentences the claim that makes the business worth building. Ask up to 3 questions if the pricing or customer is unclear.
2. List revenue streams, say which one matters most, and note any that depend on another.
3. Test the pricing: does it follow how customers receive value, and is it easy to explain?
4. Build the unit economics from the figures supplied only: revenue per customer, cost to serve, contribution margin, cost to acquire a customer and payback time. Show each calculation. If a figure is missing, mark it as unknown and give a range of plausible inputs labeled as assumptions.
5. Run a sensitivity check: what happens if acquisition cost rises 25 percent or churn doubles?
6. Check scale: which costs fall with size and which rise with it?
7. List the three assumptions that, if wrong, would break the model.
Output format
- Verdict (3 sentences): works, works with changes, or does not work yet
- Unit economics table: Metric | Value | Source (given or assumed)
- Sensitivity results
- Top risks and what evidence would reduce each
- Three changes to try first
Quality bar
- Never invent market data. Label every assumption.
- Show formulas in words so a non-finance reader can follow.
Sample output
Verdict: Works with changes. Each subscriber earns more than it costs to serve, but paying back the acquisition cost takes too long if churn stays at current levels.
| Metric | Value | Source |
| Monthly revenue per customer | 30 | Given |
| Cost to serve | 9 | Given |
| Contribution margin | 21 (70%) | Calculated |
| Cost to acquire | 180 | Given |
| Payback | about 8.6 months | 180 / 21 |
Sensitivity: if acquisition cost rises 25% to 225, payback rises to about 10.7 months.
Changes to try first: annual prepay discount, lower-cost referral channel, a higher entry price.
An example the author shared. Your result will differ.
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