# Understand the business

**FUND-01 · Fundamentals · Core**

**Lesson question:** How does the company earn money?

Original fictional examples; educational writing, not live market data, orders or production approval.

## By the end

- Explain the mechanism in the lesson question.
- Reproduce the worked comparison and recognize its failure case.

A ticker identifies a traded claim, not the underlying business. Begin with what is sold, who pays, why customers return and which resources are needed. Ratios become more meaningful after that operating story is clear.

Harbor Tools is a fictional company used throughout this path. Its figures are original teaching examples, generally in millions of dollars.

## Understand the mechanism

Separate demand drivers from accounting labels. Revenue can depend on units, prices, subscriptions, maintenance or acquisitions. Costs can be fixed, variable or commodity-sensitive. Pricing power and capital intensity shape how growth translates into cash.

Identify customer concentration, substitutes and cyclicality. A growing industry does not guarantee a profitable participant.

## Walk through the process

Write the business model in one paragraph before using valuation. Name measurable drivers that could confirm or contradict it. Use primary disclosures and footnotes rather than relying only on promotional summaries.

If the model remains unclear, investigate or pass rather than substituting a low multiple for understanding.

## Evidence and decision boundary

These are original fictional teaching figures, not a company screen. Actual analysis should use primary disclosures and distinguish management's explanation from your inference. Favorable or unfavorable evidence depends on the specific business, valuation and risk; no single ratio establishes a recommendation.

## A worked example

Harbor sells one million units at 1,000 dollars each, producing 1,000 million revenue. A variable cost of 600 per unit leaves 400 million before other operating costs.

A 10% unit decline with unchanged pricing reduces revenue to 900 million. Fixed overhead can make profit fall by more than 10%. The graph varies unit volume at a fixed price to isolate the driver.

## Graph: Understand the business—worked comparison

**Horizontal:** Units sold (millions)  
**Vertical:** Revenue (USD millions)

Fictional data from the written example. The chart organizes the comparison; its shape is not a forecast.

Complete numerical data are embedded in `scripts/fundamentals/FUND-01.js` and displayed as an accessible table in the HTML lesson.

## What would invalidate the reading?

A reader confuses industry growth with a defensible company. Competition, customer power and reinvestment can prevent owners from capturing that growth.

## Check your understanding

### What two drivers produce the example's revenue?

**Answer:** Units sold and price per unit.

**Why:** One million×1,000 dollars=1,000 million revenue.

### What is the critical failure to avoid?

**Answer:** A reader confuses industry growth with a defensible company. Competition, customer power and reinvestment can prevent owners from capturing that growth.

**Why:** Explain this risk before treating the example as a decision rule. A correct calculation does not guarantee a favorable market outcome. **Critical risk check.**

## Takeaway

Return to the question: How does the company earn money? State the observed facts, the assumptions and the failure condition separately.

## References and provenance

The cited references support definitions and conventions. The teaching prose, tickets and numerical scenarios are original; they are not attributed as historical market observations.

- [SEC Financial Statements Guide](https://www.sec.gov/about/reports-publications/beginners-guide-financial-statements)