PEG Ratio — Growth-Adjusted Valuation
Learning Objectives
After reading this chapter, you will be able to:
- Explain how p/E alone insufficient — context of growth required
- Apply: PEG = growth-adjusted valuation shortcut
- Explain how not magic number — estimate-dependent
- Explain how best used with cash flow, moat, sector awareness
Introduction
New investors err two ways: buy only low P/E, or pay any price for growth.
Good company at wrong price = bad investment.
PEG Ratio links price (P/E) to growth — growth-adjusted valuation tool.
Core Concepts
Financial Terms
| Term | Meaning |
|---|---|
| P/E Ratio | Price / EPS — price per ₹1 of earnings |
| EPS Growth | Year-over-year earnings per share change |
| PEG Ratio | P/E divided by growth rate |
| Growth-Adjusted Valuation | Price relative to expected earnings growth |
| Organic Growth | Internal business expansion vs acquisitions |
| Competitive Moat | Sustainable advantage supporting growth |
Investment Decision
Consider Buying When
✅ PEG < 1.5 ✅ Sustainable organic growth ✅ Strong cash flow ✅ High ROCE ✅ Clear moat
Exercise Caution When
❌ PEG > 2 ❌ Decelerating growth ❌ Rising debt ❌ Extreme absolute valuation
"Price is what you pay. Value is what you get." — Warren Buffett
Formula & Explanation
P/E Ratio
EPS Growth
Example: ₹10 → ₹12 EPS:
PEG Ratio
Example 1 — Company A
- P/E = 20, Growth = 10%
→ Potentially expensive vs growth
Example 2 — Company B
- P/E = 30, Growth = 40%
→ High P/E but growth-supported valuation
Interpretation Table
| PEG | Reading |
|---|---|
| < 1 | Potentially undervalued vs growth |
| 1 – 2 | Fair |
| > 2 | Potentially expensive |
Visual Guide
Worked Example — Indian Market
Example 1 - F-Score
Score 8/9 = quality candidate. Score 2/9 = likely value trap.
Example 2 - DCF Check
If IV far below market cap, market may price perfection.
Real World Example
| Company A | Company B | |
|---|---|---|
| P/E | 10 | 30 |
| EPS Growth | 5% | 40% |
Most pick A as "cheap." Years later: A stagnant; B profits multiplied.
Low P/E ≠ always cheap. High P/E ≠ always expensive.
Case Study
Company X: P/E = 50, Growth = 35% → PEG = 1.43 — expensive but growth-backed
Company Y: P/E = 15, Growth = 5% → PEG = 3.0 — low P/E but expensive vs growth
Indian Growth Names
TCS, Infosys, HCL Technologies often trade at premium P/E because market prices future growth. PEG helps ask: is premium justified?
Always verify: growth sustainable, organic, backed by cash flow and moat.
CFA Exam Tip
Senior CFA analyst beyond PEG:
- Growth sustainable or one-time?
- Organic or acquisition-driven?
- Cash flow growing with earnings?
- Moat strong enough for forecast growth?
PEG limitations — misleading for:
- Cyclical companies
- Commodity businesses
- Loss-making firms
- Banks/financials
Growth estimates are forward-looking and uncertain.
Combine PEG with: cash flow, ROCE, moat analysis.
Common Mistakes
❌ High P/E + slow growth (PEG >> 2) ❌ Overly optimistic management guidance ❌ Revenue up, cash flow flat ❌ EPS growth mainly from buybacks ❌ Growth funded by rising debt
Key Takeaways
- P/E alone insufficient — context of growth required
- PEG = growth-adjusted valuation shortcut
- Not magic number — estimate-dependent
- Best used with cash flow, moat, sector awareness
- Goal: wonderful company at fair price, not fair company at wonderful price
Disclaimer: PEG uses estimated growth; actual results may differ materially.
Practice Questions
Chapter: Peg Ratio | Part 10 | Try before reading answers.
Q1 (Conceptual): Peg Ratio — what is the core message of this chapter in one sentence?
Q2 (Calculate): Apply formula: P/E = (Price) ÷ (EPS) — use numbers from this chapter.
Q3 (Application): How do P/E Ratio and EPS Growth interact in Peg Ratio decisions?
Q4 (Red Flag): Red flag: ❌ High P/E + slow growth — why avoid relying on Peg Ratio alone?
Q5 (CFA Style): CFA-style trap when interpreting Peg Ratio?
Q6 (Decision): Peg Ratio looks strong but valuation stretched — invest, wait, or avoid?
Q7 (Lab): Complete one Peg Ratio exercise in Part 10 Practice Lab.
Answer Key
Q1 (Conceptual)
P/E alone insufficient — context of growth required
Q2 (Calculate)
Step-by-step substitution; verify consolidated annual report figures.
Q3 (Application)
Both must align — strong P/E Ratio with weak EPS Growth (or vice versa) needs deeper AR review.
Q4 (Red Flag)
❌ High P/E + slow growth (PEG >> 2)
Q5 (CFA Style)
Senior CFA analyst beyond PEG:
Q6 (Decision)
Usually wait for MOS unless quality exceptional. Also: PEG = growth-adjusted valuation shortcut
Q7 (Lab)
See Part 10 Practice Lab and verify with lab Answer Key.
Go deeper: Part 10 Practice Lab
FAQ {#faq}
Q: Peg Ratio — what is the second check when evaluating this concept?
A: ❌ Overly optimistic management guidance
Q: How do you connect theory with Indian market practice for Peg Ratio?
A: Pull the same metric's 3-year trend from Screener/Trendlyne plus the company annual report — a paper formula alone is not sufficient.
Q: peg-ratio — why should you avoid this mistake?
A: ❌ High P/E + slow growth (PEG >> 2)
Q: peg-ratio — ❌ Revenue up, cash flow flat red flag — why avoid it?
A: ❌ Revenue up, cash flow flat
Q: How do I drill this chapter's concepts in the Practice Lab?
A: Open Part 10 Practice Lab → use the FAQ Drill row for peg-ratio; verify answers in the Chapter FAQ Quick Index.
Practice Lab FAQ: Full part FAQ index — Part 10 Practice Lab
Related Topics
- Previous Chapter: 72-Piotroski F Score
- Next Chapter: 74-Dcf Valuation Advanced
- Part Overview: Part 10 Advanced Quant Analysis
- Book Index: Full Table of Contents
Disclaimer: Educational content only. Not investment advice. Consult a qualified financial advisor before investing.