Industry Market Sizing (TAM/SAM/SOM) Model

Act as an Investment Banking Analyst and Venture Capital Market Associate.

Build a Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) model for:
- Industry / Product: [Describe product, pricing model, and geography]
- Target Customer Profile: [B2B SMBs, Enterprise, B2C, specific verticals]
- Average Revenue Per User/Account (ARPU): [Projected price/contract value]

Provide the following calculations and assumptions:
1. Top-Down Market Sizing:
   - Industry reports data triangulation (e.g. Gartner, IDC, Statista baselines).
   - Global industry size filtered down by geographic and segment filters.
2. Bottom-Up Market Sizing (Primary Method):
   - Total number of potential buyers in the target universe (data sources: Census, LinkedIn headcount, business registries).
   - Multiplication by expected annual contract value / ARPU.
3. TAM / SAM / SOM Breakdown:
   - TAM: Global theoretical market limit.
   - SAM: Market reachable with current product scope and distribution channels.
   - SOM: Realistic 3-5 year capture target based on sales capacity and competition.
4. Sensitivity Table: 3 scenario projections (Conservative, Base, Bull) with key risk factors.

Provide explicit formulas and show all math.