The hardest lesson in investing
You can find the best company in the world
and still lose money — not because the business
was bad, but because you paid too much for it.
People don't think about the price. They think about the story. They hear AI is the future, a company is taking over, everybody's buying in — so they jump. But they never stop to ask: what am I actually paying for this business?
That question is the difference between investing and chasing. Let's get a little technical — but keep it simple.
The P/E Ratio: Your Starting Point
One of the main ways to value a company is the Price-to-Earnings ratio — the P/E. Here's what it actually means.
A P/E of 20× means you're paying $20 for every $1 the company earns. That number alone tells you nothing. Context is everything.
Compare to
Its Industry
Is it cheaper or more expensive than its competitors? A 15× P/E in a 20× sector is a potential signal.
Compare to
Its Own History
Is it trading above or below its historical average? A discount to itself can mean opportunity.
Compare to
Its Growth Rate
A high P/E on a fast-growing company may still be cheap. A low P/E on a stagnant one may still be expensive.
The Myth of "Cheap" and "Expensive"
Here's where most beginners get it wrong. They see a low P/E and think bargain. They see a high P/E and think overpriced. It's not that simple.
Low P/E
Doesn't always mean cheap.
Sometimes a low P/E just means the business isn't growing — and the market already knows it. You're not finding a deal. You're buying a slow business at a fair price for a slow business.
High P/E
Doesn't always mean expensive.
A high P/E on a fast-growing company means the market is paying up for future earnings. If the growth justifies it, what looks expensive today may be completely reasonable based on where the business is heading.
Trailing vs. Forward P/E — This Is Where You Level Up
Looking Backward
Trailing P/E
Based on what the company earned over the last 12 months. It's real data — but the market doesn't trade on the past.
Looking Forward
Forward P/E
Based on projected earnings over the next 12 months. This is what the market actually prices in — future potential, not past performance.
The key insight: When you buy a stock, you're not buying what the company did last year. You're buying what it's going to become. If earnings are expected to grow fast, a high multiple today starts to compress — what looks expensive right now may actually be reasonable when you run the forward numbers.
You're not buying what the company did last year. You're buying what it's going to become.
— Vic Sisa
Margin of Safety: Don't Pay for Perfection
You never want to pay a price that assumes everything goes perfectly. Because in real life, nothing goes perfectly. Companies miss earnings. Markets panic. Industries shift. If you paid full price for a perfect scenario, any deviation hurts you.
I've made this mistake. Saw companies running, jumped in late, got stuck — not because the business was bad, but because I'd already paid for all the growth upfront. That's frustrating. And it's avoidable.
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On down days — buy in. Pullbacks are opportunities. When a great business goes on sale, that's your margin of safety working in your favor.
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On up days — rebalance. When a position runs, check your allocation. Take profits where appropriate. Keep your portfolio mix disciplined.
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Buy in sections, not all at once. Dollar-cost averaging into a position protects you from paying peak price on day one.
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Paying too much for a stock is like showing up to a concert after the headliner already played two hours. The show's still going — but you missed the best part, and you paid full price to get in.
Most of the upside was already priced in before you arrived. That's what chasing looks like.
Two Investors. Same Stock. Different Outcomes.
The Chaser
"Is this a great company?"
Buys based on the story. Ignores the price. Gets in late, overpays, and can't understand why a "great company" is losing them money.
The Owner
"Is this a great company
at the right price?"
Waits for the entry. Buys with a margin of safety. Holds with conviction because they know exactly what they paid for and why.
Your Process — In Order
The sequence matters. Don't skip to valuation before you've done the work on the business.
Step 1
The On It Test
Is it a great business?
Growing revenue, real earnings, a leader in its space, and you understand how it makes money. If it fails here, stop.
Step 2
Valuation Check
Am I paying a fair price for that growth?
Compare P/E to industry, history, and growth rate. Look at forward earnings. Check if the price gives you a margin of safety.
Step 3
The Owner's Question
Would I hold this if the price didn't move for a year?
If yes — buy with conviction and patience. If no — you're chasing, not investing.
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The market doesn't care how you feel about a stock. It only cares what you paid for it. Master that truth and you move from spectator to owner — permanently.
In Issue 007, we bring it all together: how to build your first real portfolio — how many stocks, which sectors, and how to think about your personal mix based on where you are in life. Almost there.