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KembaraXtra–Islamic Finance–Islamic Capital Market – Relationship Between P/E, ROE, and P/B Ratios
Big Picture (One-Line Idea)
ROE explains profitability, P/B reflects how the market values that profitability, and P/E shows how much investors are willing to pay for those earnings. All three ratios are connected and should be read together, not separately.
1. Role of Return on Equity (ROE)
- ROE measures performance
- It shows how efficiently a company uses shareholders’ equity (share capital + retained earnings) to generate profit
- Higher ROE = better use of shareholders’ funds
Simple example:
If a company earns USD 20 million using USD 100 million of equity → ROE = 20%
2. How ROE Influences P/B Ratio
- P/B measures valuation of net assets
- Investors are willing to pay more than book value if a company generates high ROE
- Therefore:
- High ROE → Higher P/B
- Low ROE → Lower P/B
- Company A: ROE = 18% → P/B = 3
- Company B: ROE = 6% → P/B = 1
Investors value Company A more because it earns more from the same equity base.
3. How ROE Influences P/E Ratio
- P/E measures valuation of earnings
- Companies with high ROE usually have:
- Strong profitability
- Better growth expectations
- Investors are willing to pay more per dollar of earnings
So:
- High ROE → Higher P/E
- Low ROE → Lower P/E
4. Direct Relationship Between P/B and P/E
There is a mathematical and economic link between P/B and P/E through ROE:
P/B ≈ P/E × ROE
This means:
- For the same P/E, a company with higher ROE should have a higher P/B
- For the same P/B, a company with higher ROE should justify a higher P/E
5. Simple Combined Example
Assume two Shari’ah-compliant companies:
Company X (Efficient)
- ROE = 20%
- P/E = 12
- Implied P/B ≈ 12 × 0.20 = 2.4
- ROE = 8%
- P/E = 12
- Implied P/B ≈ 12 × 0.08 = 0.96
Even with the same P/E, Company X deserves a higher P/B because it uses equity better.
6. What Investors Learn by Using All Three Together
- ROE answers: “How good is management at generating profits?”
- P/B answers: “How much am I paying for the company’s net assets?”
- P/E answers: “How much am I paying for the company’s earnings?”
Used together, they help investors avoid mistakes such as:
- Buying a low P/E stock with weak ROE (value trap)
- Overpaying for high P/B stocks without strong ROE support
7. Islamic Finance Perspective
- Islamic equity investing emphasises real assets, equity, and risk-sharing
- ROE reflects genuine business performance (not interest leverage)
- P/B aligns with asset-backed valuation
- P/E reflects fair pricing of halal earnings
👉 ROE drives value, P/B reflects asset valuation, and P/E reflects earnings valuation.
A strong Shari’ah-compliant company typically shows high ROE supported by reasonable P/E and P/B ratios.
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