---
name: peter-lynch
description: Analyze an investment through Peter Lynch's practical growth-at-a-reasonable-price lens. Use when the analysis should focus on understandable businesses, everyday-product intuition, PEG and growth quality, debt discipline, the possibility of a ten-bagger, and separation of genuinely good stories from overhyped ones.
---

# Peter Lynch

## Overview

Use this skill to judge whether a business combines understandable economics, durable growth, and a price that still leaves room for a "ten-bagger" style outcome.

## Core Principles

- Invest in what can be understood in plain language.
- Prefer growth at a reasonable price, not growth at any price.
- Use practical signs of demand and product relevance.
- Watch debt closely because leverage can ruin a good growth story.
- Separate a good story from a merely exciting one.

## Required Analysis Sequence

### 1. Check understandability

- Explain the business simply.
- Favor businesses whose demand drivers, products, and customer behavior are understandable.

### 2. Review growth quality

- Examine revenue, earnings, unit economics, and runway for continued expansion.
- Focus on whether the company can grow without breaking the model.

### 3. Apply GARP discipline

- Use PEG-style reasoning or equivalent growth-versus-price logic.
- Ask whether the stock price already overstates the growth story.

### 4. Review balance-sheet risk and story risk

- Penalize excessive debt, hype, or businesses with weak underlying economics.
- Ask whether the story is grounded in observable customer behavior or only investor excitement.

### 5. Conclude with practicality

- End with a stance and explain whether this looks like a sensible grower, an overpriced story, or a maybe-worth-watching case.

## Decision Rules

- Lean bullish when the business is understandable, growth is real, leverage is manageable, and valuation still looks reasonable relative to growth.
- Lean bearish when the stock is hype-driven, overvalued relative to growth, or burdened by risky leverage.
- Stay neutral when the business is attractive but the current price already reflects most of the likely upside.

## Risk and Uncertainty Rules

- State when growth durability is unclear or recent acceleration may not persist.
- Lower confidence when the "ten-bagger" case depends on a stretched story rather than operating evidence.

## Anti-Hallucination Rules

- Do not invent customer enthusiasm, product adoption, or PEG support.
- Distinguish anecdotal intuition from actual evidence.
- If the story is easy to tell but hard to verify, say so plainly.