None of the three alone is enough.
The most reliable approach is using them together, but if forced to choose, PEG Ratio generally gives the most confidence.
Let’s break it down clearly.
Why Strong Fundamentals Can Still Look Overvalued
Even when fundamentals are strong, stocks may look expensive because:
Investors expect future growth
Market sentiment is bullish
Institutional investors are accumulating
Industry growth is strong
This is why companies like those favored by Warren Buffett sometimes trade at high valuations for long periods.
Example:
A fast-growing bank may have high P/E
But investors expect earnings to double soon
So it looks expensive — but actually isn’t
Comparing the 3 Methods
1. P/E Ratio (Good but Limited)
What it tells you:
How much investors are paying for ₦1 of earnings.
Example:
P/E = 10 → Cheap
P/E = 30 → Expensive (usually)
But here’s the problem:
Different sectors have different normal P/E
Typical P/E by Sector (General Guide)
Banks → 5–12
Consumer goods → 10–25
Telecom → 12–20
Oil & Gas → 5–15
Tech → 20–50+
So P/E alone can mislead.
2. 52-Week High & Low (Weakest Method)
This only tells you price movement, not value.
Example:
A stock at 52-week high may still be cheap
A stock at 52-week low may still be expensive
This method is more for timing, not valuation.
So this is least reliable.
3. PEG Ratio (Most Reliable of the Three)
PEG includes:
P/E ratio
Growth rate
That makes it more intelligent.
PEG Interpretation
PEG 1 → Overvalued ⚠️
Example:
Company A P/E = 20
Growth = 25%
PEG = 0.8 → Actually cheap
This is why PEG gives more confidence.
Final Ranking (Most Reliable → Least Reliable)
🥇 PEG Ratio (Best)
🥈 P/E Ratio (Good but incomplete)
🥉 52-Week High/Low (Weak for valuation)
What Smart Investors Actually Do
The best investors combine:
P/E ratio
PEG ratio
Revenue growth
Earnings growth
Debt level
Dividend history
This gives real confidence.