# A practical buy framework

**FUND-12 · Fundamentals · Core**

**Lesson question:** When is an understandable thesis attractive at the price?

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.

**Prerequisites:** FUND-01

A buy framework combines business quality, valuation, survival, portfolio capacity and a reason to act. It does not turn a checklist into certainty. Passing is a valid result.

Separate liking the business from liking its risk-adjusted economics at the proposed price and size.

## Understand the mechanism

A lower quote can improve a bargain or reflect information that reduced value even more. Update both price and assumptions. Technical structure may help timing for some approaches but does not repair a flawed business case.

Long-horizon ownership and short-horizon options need different timing justifications.

## Walk through the process

Write adverse, base and favorable scenarios with supporting evidence. Decide risk size and alternatives rather than using conviction as a substitute for capital discipline. Staged entries can reduce dependence on one price, not guarantee protection.

The hypothetical comparisons here are educational, not individual recommendations.

## 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

Independent fictional values are 25 adverse, 40 base and 55 favorable. At market price 50, a favorable result is already needed; at 30 the base case offers more room if assumptions remain intact.

The valuation case is more favorable at 30 on these limited facts. That does not make 30 safe: even the 25 adverse estimate can be too optimistic. The chart uses no invented probabilities.

## Graph: A practical buy framework—worked comparison

**Horizontal:** Adverse / base / favorable scenario  
**Vertical:** Value per share (USD)

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-12.js` and displayed as an accessible table in the HTML lesson.

## What would invalidate the reading?

Buying below an old target without updating adverse information can increase exposure to a broken thesis. Averaging down is not automatically disciplined.

## Check your understanding

### Why is the same 40 base case less attractive at 50 than at 30?

**Answer:** The higher price requires outcomes above the base case.

**Why:** All else equal is essential.

### What is the critical failure to avoid?

**Answer:** Buying below an old target without updating adverse information can increase exposure to a broken thesis. Averaging down is not automatically disciplined.

**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: When is an understandable thesis attractive at the price? 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)