PART III: Financial Planning and Opportunity Assessment

"Great recommendations are not built on optimistic guesses. They are built on realistic assumptions supported by credible financial analysis."

Understanding the current financial position of an organization is only the beginning.

Business leaders rarely ask consultants simply to diagnose problems.

They ask them to recommend solutions.

Those solutions must be financially realistic.

Whether proposing a new product launch, entering a new market, implementing new technology, expanding internationally, or acquiring another company, decision-makers want to know one fundamental question:

Is the opportunity large enough to matter?

Case competitors face exactly the same challenge.

Judges expect recommendations to be supported by credible financial reasoning rather than optimistic assumptions. It is not enough to say that sales will increase or costs will decrease. Teams must demonstrate where those numbers come from, whether the assumptions are realistic, and whether the opportunity is financially meaningful.

This section introduces the financial planning tools used to answer those questions.

You will learn how to estimate market opportunities, build financial assumptions, construct realistic budgets, evaluate investments, value organizations, and test the robustness of your recommendations under uncertainty.

Rather than focusing on accounting, this section focuses on decision-making.

Every calculation should answer a business question.

Every assumption should strengthen the credibility of your recommendation.

Throughout this section, remember an important principle:

Judges rarely expect perfect numbers. They expect logical thinking supported by reasonable assumptions.

That is the purpose of financial planning.

It transforms ideas into credible business recommendations.

Chapter 5 Market Sizing with TAM, SAM and SOM

Estimating the Opportunity Before Building the Solution

Learning Objectives

By the end of this chapter you should be able to:

understand the purpose of market sizing
distinguish between TAM, SAM and SOM
estimate market opportunities using logical assumptions
evaluate whether an opportunity is financially meaningful
communicate market potential using executive-level visuals
avoid unrealistic market projections
connect market sizing directly to strategic recommendations

Why This Matters

One of the fastest ways to lose credibility in a case competition is to present unrealistic market estimates.

"We expect to capture 15% of the global market."

"We believe revenues will reach $2 billion within five years."

Judges hear statements like these every year.

Very few believe them.

Successful competitors understand that market sizing is not about producing the largest possible number.

It is about demonstrating that you understand the market you intend to serve.

Investors, executives and judges all ask similar questions.

How large is the opportunity?

How much of that opportunity can we realistically reach?

How much can we reasonably capture?

TAM, SAM and SOM provide a structured framework for answering those questions.

Thinking Like an Investor

Before investing millions of dollars, executives ask three questions:

Is the market worth entering?

↓

Can our organization actually compete?

↓

How much business can we realistically win?

These questions correspond directly to the three components of market sizing.

Understanding TAM

Total Addressable Market

TAM represents the total revenue opportunity if every potential customer purchased your product or service.

It answers the question:

How large could this market eventually become?

Think of TAM as the theoretical ceiling.

It assumes:

every potential customer
every geographic region
every applicable market segment
complete market penetration

Very few organizations ever achieve their TAM.

That is not the purpose.

Its purpose is to demonstrate the size of the overall opportunity.

Example

Suppose a company develops educational software for university students.

Canada has approximately two million post-secondary students.

If the average annual subscription costs $150:

TAM =

2,000,000 students × $150

= $300 million annually

This represents the maximum possible opportunity within Canada.

Building Credible TAM Estimates

Use reliable data whenever possible.

Possible sources include:

government statistics
census information
industry associations
market research reports
annual reports
trade publications

Avoid outdated estimates.

Explain your assumptions clearly.

Remember:

The objective is credibility—not precision.

Understanding SAM

Serviceable Addressable Market

Few organizations can serve an entire market immediately.

SAM narrows TAM to the customers your organization can realistically serve given its capabilities.

It considers:

geography
regulations
language
technology
distribution channels
pricing
operational capacity

SAM answers the question:

Which portion of the total market can we actually serve?

Continuing the Example

Suppose the software is currently available only in English and only targets Canadian universities.

Private colleges and international markets are excluded.

After adjusting for accessibility:

SAM becomes

$180 million.

The opportunity remains significant—but is now realistic.

Understanding SOM

Serviceable Obtainable Market

SOM is the most important number in case competitions.

It estimates the portion of SAM the organization can realistically capture during the planning horizon.

It reflects:

competition
brand awareness
marketing capability
production capacity
customer switching behaviour
expected adoption rates

This is no longer theoretical.

Example

Suppose:

SAM = $180 million

Expected market share after five years = 4%

SOM

= $7.2 million annually

Notice how much more believable this estimate becomes.

Instead of claiming hundreds of millions of dollars in immediate revenue, the recommendation demonstrates a practical understanding of market dynamics.

Building the Story

TAM, SAM and SOM should never appear as isolated numbers.

They should tell a logical business story.

Opportunity

↓

Accessibility

↓

Competitive Reality

↓

Financial Expectations

When judges understand this progression, your recommendation immediately becomes more credible.

Top-Down and Bottom-Up Approaches

There are two common ways to estimate markets.

Top-Down

Start with the total market.

Gradually narrow it.

This approach is quick and often useful in competitions.

Bottom-Up

Begin with realistic operational assumptions.

For example:

customers per day
average transaction value
operating locations
annual operating days

Multiply upward.

Bottom-up estimates often appear more realistic because they connect directly to operational capacity.

Whenever possible, use both approaches to validate one another.

Presenting Market Size

Avoid overwhelming judges with complicated tables.

Simple visuals communicate far more effectively.

Good presentations include:

funnel diagrams
stacked bar charts
segmented market diagrams
clean tables showing assumptions

Every visual should answer one question:

Why do we believe these numbers?

Common Assumptions

Typical assumptions include:

population
demographic segments
average spending
adoption rates
conversion percentages
customer retention
annual growth
pricing

State assumptions clearly.

Judges will rarely challenge reasonable assumptions that are transparent.

Hidden assumptions create uncertainty.

Discover Your Mad Skills Principle

Market sizing is not about proving your recommendation is large. It is about proving your recommendation is believable.

Credibility always beats optimism.

Coach's Lens

Many competitors proudly present billion-dollar TAMs.

Experienced judges immediately become skeptical.

Ask yourself:

"If I were investing my own money, would I believe this?"

If the answer is no, revise your assumptions.

Deciphering Cases

One of the defining characteristics of strong case competitors is their ability to separate possibility from probability.

Anything is possible.

Only some outcomes are probable.

TAM measures possibility.

SAM measures capability.

SOM measures probability.

The best recommendations are built around the probable—not the possible.

Common Mistakes

Avoid these common errors:

confusing TAM with SOM
assuming unrealistic market share
ignoring competitors
using outdated market data
failing to explain assumptions
presenting large numbers without context
estimating markets that are too small to justify the recommendation

Mad Skills Drill

Choose a business idea.

Estimate:

Document every assumption.

Now ask another student to challenge those assumptions.

Revise your estimates based on the discussion.

Notice that stronger assumptions usually produce stronger recommendations.

Chapter Summary

Market sizing transforms strategic ideas into financially credible opportunities.

By distinguishing between total opportunity, accessible opportunity and realistically obtainable opportunity, competitors demonstrate the disciplined thinking expected by judges, executives and investors.

The objective is not to predict the future perfectly.

It is to provide a logical, evidence-based estimate that supports strategic decision-making.

Key Takeaways

✓ TAM measures the total market opportunity.

✓ SAM narrows the opportunity to customers the organization can realistically serve.

✓ SOM estimates what the organization can realistically capture.

✓ Every estimate depends on transparent assumptions.

✓ Credibility is more important than optimism.

✓ Market sizing provides the financial foundation for every strategic recommendation.

Looking Ahead

Market sizing tells us how large the opportunity could be.

The next challenge is determining whether those estimates make financial sense.

In the next chapter, we will develop rapid estimation techniques that allow competitors to build realistic financial assumptions even when limited information is available.