skills/industry-competition/references/modules/M032-market-sizing-and-tam-discipline.md

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<!-- Module: 032 | Title: Market Sizing and TAM Discipline -->

## PART VII - INDUSTRY AND COMPETITIVE ANALYSIS | MODULE 032

# Market Sizing and TAM Discipline

> Mission. Build bottom-up market sizes and prevent promotional TAM estimates from contaminating valuation.

## Decision output

Objective: Build bottom-up market sizes and prevent promotional TAM estimates from contaminating valuation. The completed work product must be reproducible from evidence, show the downstream financial or decision effect when material, state the strongest contrary case, and define a dated update rule.

## Explicit operating procedure

1. Define the exact product/service and buyer population before calculating TAM. Separate current market, serviceable available market, and realistic obtainable market.

1. Build bottom-up demand from number of buyers/units, penetration, replacement/adoption rate, usage, and price; show all units and conversions.

1. Use top-down industry estimates only as a cross-check and reconcile scope, geography, calendar year, nominal/real price, and channel definitions.

1. Model adoption constraints including customer ROI, budgets, infrastructure, regulation, implementation capacity, supply, and replacement cycles.

1. Avoid double counting overlapping categories, platform revenue and underlying transaction value, or multiple value-chain layers.

1. Translate company forecast into implied market share and installed-base penetration to test whether valuation assumptions require an impossible TAM path.

## Required evidence and model bridge

- Primary-source set: peer filings, industry data, regulator data, channel evidence, technology roadmaps. Preserve exact document/version, date, period, and source location for every material factual input used in market sizing and tam discipline.

- For each key concept - bottom-up units, penetration, replacement, normalized price, SAM, geography - state whether it is a reported fact, analyst calculation, management claim, external estimate, or judgment. Quantitative concepts must retain raw components and units; qualitative concepts must retain the specific evidence and counterevidence.

- Map only economically relevant findings into the model or decision record. Process-control modules such as market sizing and tam discipline may have no direct valuation line; in that case document the downstream error or governance risk the control prevents.

## Metrics and calculation controls

| Metric / concept | Construction | Required validation |
| --- | --- | --- |
| bottom-up TAM | Sum of addressable customers/units × realistic annual spend or units per customer, segmented by geography, use case, and adoption constraints. | bottom-up TAM: Rebuild the market denominator bottom-up from independent sources, align geography/product/time scope with the company numerator, and sensitivity-test uncertain adoption or pricing assumptions. |
| serviceable market | Portion of TAM reachable with the company's current or planned product, geography, channel, regulatory approvals, and capacity within the forecast horizon. | serviceable market: Rebuild the market denominator bottom-up from independent sources, align geography/product/time scope with the company numerator, and sensitivity-test uncertain adoption or pricing assumptions. |
| implied terminal share | Terminal-year company revenue or units divided by estimated terminal addressable market revenue or units. | implied terminal share: Recalculate from same-scope numerator and denominator; confirm period, units, cohort/geography, and issuer definition; reconcile material differences to filings or operating data. |



## Worked application

> Case: a $100B promotional TAM becomes a $9B serviceable market after real constraints.

- Reconstruct the relevant reported fact from primary evidence before interpreting the case. For market sizing and tam discipline, show the raw components rather than only the resulting ratio or narrative.

- Build the causal chain through bottom-up units, penetration, replacement, normalized price, then identify which link is directly observed and which link remains an assumption.

- Calculate bottom-up TAM, serviceable market, implied terminal share from sourced components under the reported/base interpretation and at least one skeptical alternative interpretation.

- Translate the difference between cases into the variable that matters for market sizing and tam discipline: evidence quality, revenue, operating profit/NOPAT, free cash flow, invested capital, financing/dilution, risk, or valuation. Mark non-applicable links instead of inventing them.

- Expert consistency test: use terminal implied share and capacity as a valuation consistency check.

- Precommit the specific future filing, KPI, customer/supplier observation, regulator action, or market input that would materially invalidate the market sizing and tam discipline conclusion.

## Failure tests

- FAIL if bottom-up units cannot be defined and reproduced from the source pack.

- FAIL if market size cannot be reconstructed from countable units, price/usage, adoption, and replacement without double counting or implausible customer budget assumptions.

- FAIL if the market sizing and tam discipline conclusion depends on an unstated assumption, unreconciled definition, or evidence that cannot be traced to its source/version.

- FAIL if evidence materially inconsistent with the market sizing and tam discipline conclusion is omitted, reclassified, or dismissed without a documented definition, materiality, causal, timing, and source-quality analysis.

## Completion test

A senior reviewer must be able to reproduce the market sizing and tam discipline conclusion, vary the most sensitive assumption independently, trace the change through the model, understand the strongest opposing case, and identify the next evidence that would force an update. If any link is missing, the module remains open.