Model the impact of a business decision
The prompt
Model the impact of a business decision.
Decision: {{hiring_new_product_tier_new_market_vendo}}
Current state: {{revenue_costs_headcount_customers}}
Cost:
- One-time: {{setup_hiring_dev}}
- Ongoing: {{monthly_annual}}
Expected benefit: {{revenue_savings_or_value}}
Timeline to impact: {{months_until_benefits_show}}
Confidence: {{how_certain_are_you}}
Please model:
1. Break-even: when do benefits cover costs?
2. 12-month P&L impact month by month
3. Best / base / worst case
4. ROI at 12 and 24 months
5. Key risks that would cause the model to fail Why this works
Separating one-time costs from ongoing costs and quantifying both the investment and the expected benefit produces the P&L impact analysis that most business decision conversations skip. The breakeven timeline output converts the financial model into a decision-relevant summary — 'this pays back in 14 months' is more actionable than a spreadsheet of assumptions. Building three scenarios (upside, base, downside) makes the risk visible rather than presenting only the case for the decision.
Risks & review
Business decision models are only as reliable as the benefit assumptions, which are almost always optimistic at time of decision. Build in a systematic conservatism adjustment (haircut expected benefits by 20-30%) to compensate for optimism bias. Also ensure the model includes opportunity cost — the capital and management attention invested in this decision cannot be invested in alternatives.