Learn · Chapter 06 of 09
Valuation & margin of safety
Valuation converts analysis into a decision: what is it worth, and what will I pay? This chapter builds DCF intuition without spreadsheet worship, shows how to use multiples honestly, and makes margin of safety a habit rather than a slogan.
Core · 4 lessons · 15 min read
Key takeaways
- Value is future cash discounted; price is mood today — profit lies in the gap.
- Ranges plus margin of safety beat false precision every time.
- A written thesis with sell triggers is part of valuation, not extra credit.
Lesson 1
Thinking in cash flows, not prices
- A business is worth the cash it will generate, discounted for time and risk. Everything else is shorthand.
- Growth, longevity of growth, and required return drive value — small changes in assumed growth years swing DCFs wildly.
- Use our DCF calculator to feel this sensitivity before trusting any target price, including your own.
Lesson 2
Relative valuation done honestly
- Compare P/E, EV/EBITDA and P/S to sector peers with similar growth and ROCE — adjust for differences, don't average blindly.
- EV/EBITDA beats P/E for leveraged or acquisitive companies since it includes debt and ignores amortisation noise.
- Footnote the cycle: mid-cycle earnings make cyclicals look cheap; peak earnings make them look cheapest right before the fall.
Lesson 3
Margin of safety as process
- Estimate a range, not a point — then demand 25–30%+ discount for quality, more for uncertainty.
- Size positions by conviction and discount: full size only at deep value, starter size at fair value.
- Write the thesis and the sell triggers before buying; re-read both instead of rationalising later.
Lesson 4
When to sell (the neglected half)
- Sell when thesis breaks (moat erosion, governance failure), when price exceeds optimistic value, or when a better opportunity funds itself.
- Trimming euphoric winners into strength beats holding to the top — you will never sell the peak, so stop trying.
- Review annually against fresh numbers; narratives age, statements don't lie for long.
Mistakes that cost money
- Building a 10-year DCF with 25% growth to justify today's price (reverse-engineering).
- Averaging peer multiples across businesses with different ROCE and growth.
- Buying cyclicals at peak-cycle 'low P/E' without normalising earnings.
Chapter FAQ
Is DCF practical for retail investors?
As intuition, absolutely; as precision, never. Use DCF to understand which assumptions your price implies (reverse DCF), then judge whether those assumptions are sane.
What margin of safety is enough in India?
25–30% below conservative value for quality large-caps, 40–50%+ for small-caps, cyclicals and governance-grey names. Volatility here pays patient buyers — demand compensation for it.
PEG ratio — useful shortcut?
Roughly: P/E divided by growth rate under ~1 can flag bargains, but it breaks for cyclicals, one-off growth spurts and low-quality growers. A starting screen, not a verdict.
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