🛡️Step 7: Risk Management and Complete Decision Tree (+ QMA AI Advisor)
📘 Educational, historical example — NOT a current signal, recommendation or order to trade. The specific numbers (entries, risk and target levels, success rate, holding period) are illustrative and refer to the past. Past results do not guarantee future ones. QMA is an analytical and educational tool, not investment advice.
Step 7: Risk Management and Complete Decision Tree
Series "Beginner's Guide to Stock Trading" — final part 7/7.
Previous: Step 6 — Selecting Stocks Based on 5 Pillars and Smart Money Confluence. Now we'll put it all together.
You've reached the end of the series. In steps 1–6, we covered what to trade and when: you found your style, chose a strategy, learned to read market phases, sentiment, and fear, and finally how to select specific stocks based on the five pillars and the confluence of "smart money."
And now I'll tell you something you should learn first, even though it comes last:
The stocks you pick matter much less than how you manage risk.
Paul Tudor Jones — one of the greatest traders in history — summed it up in one sentence: "It doesn't matter if you're right. It matters how much you make when you're right and how much you lose when you're wrong." This is the whole secret. Two people can pick the exact same stocks, and one will get rich while the other will go broke — because one manages risk and the other doesn't.
This part is about the most important skill. And at the end, you'll get a decision tree — a 10-step checklist that ties the entire series into one repeatable habit.
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Part 1: Risk Management as Skill #1
Why Defense Comes Before Offense
A beginner thinks: "How much can I make?" A professional thinks: "How much can I lose?" That's the whole difference between a professional and an amateur.
The reason is mathematical and it's brutal. Look at the math of return:
| You Lose | How Much You Need to Earn to Break Even |
|---|---|
| −10 % | +11 % |
| −20 % | +25 % |
| −33 % | +50 % |
| −50 % | +100 % |
| −75 % | +300 % |
| −90 % | +900 % |
★ Insight: A big loss isn't "bad luck," it's a mathematical trap. Every percentage you lose is more expensive to regain than it was to lose. Therefore, the first rule is: don't let a big loss occur. Small controlled losses are the cost of doing business. Big uncontrolled losses are the end of business.
"Survive First" — Who Survives, Wins
Markets move in cycles (remember Step 4). After every bear market comes a bull market. After every crisis comes recovery. The only way not to miss out on that recovery is to live to see it with capital.
Ed Thorp, a mathematician who beat both roulette and Wall Street, said the main goal isn't to maximize profit — it's to avoid account destruction (risk of ruin). If you burn out, you're out of the game forever, no matter how good your idea was. The market won't give you a second chance if you have nothing to play with.
Risk of ruin = the probability that you'll lose so much capital that you can't continue. Your job as a trader isn't to "be right" — it's to keep this probability close to zero so you're still in the game when the big opportunity comes.
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Part 2: Position Size — How Much to Bet
Position sizing is, according to Van Tharp (Trade Your Way to Financial Freedom), the most underrated part of trading and at the same time the one that most determines the outcome. It's not about which stock you buy — it's about how much of your account you put into it.
The 1–2% Risk per Trade Rule
The simplest and most robust rule used by professionals: never risk more than 1–2% of your account on a single trade.
Note — "risking 1%" does not mean putting 1% of your account into a stock. It means that if the trade doesn't work out and you exit at your stop level, you'll lose only 1% of your account. That's the difference between position size and risk size.
Example calculation (fixed-fractional sizing):
- Account: 100,000 CZK
- Risk per trade: 1% = 1,000 CZK (that's how much you can lose)
- Stock costs 200 CZK, your stop level is 184 CZK (−8%)
- Risk per 1 stock = 200 − 184 = 16 CZK
- Number of stocks = 1,000 CZK ÷ 16 CZK = 62 stocks
- Total position = 62 × 200 = 12,400 CZK (i.e., 12.4% of the account)
★ Insight: This rule keeps you alive even in a losing streak. If you risk 1% per trade, you'd need 20 losses in a row to lose 18% of your account. At 10% per trade, a few unlucky trades would put you in the mathematical trap from the table above. Small bets = long breath.
Kelly Criterion — and Why Only Half
Ed Thorp popularized the Kelly Criterion — a formula that tells you what optimal portion of capital to bet so your account grows as fast as possible in the long run:
Kelly % = W − [ (1 − W) / R ]
where W = probability of winning (win rate) and R = ratio of average gain / average loss.
Example: you win in 50% of cases (W = 0.5) and your average gain is 2× larger than your average loss (R = 2):Kelly = 0.5 − (0.5 / 2) = 0.25 → the formula says "bet 25% of your account."
But 25% on one trade is suicidal in reality. Why? Because:
- You don't know your actual W and R — you only estimate them from the past, and the future is different.
- Full Kelly has brutal swings — −50% drawdowns are normal on the way to profit. Most people can't handle it psychologically and bail out at the worst point.
Ralph Vince (optimal f) went even further and showed that betting more than the mathematically optimal share not only doesn't make you richer faster, but actively destroys you — the growth curve falls steeply after exceeding the optimum. Bigger bet ≠ bigger profit. Beyond a certain point, it's pure risk without reward.
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Part 3: Stop Alert — How to Protect Capital
O'Neil's −7/−8% Rule
William O'Neil (founder of Investor's Business Daily, author of the CAN SLIM method) had one strict, simple rule: if a stock drops 7–8% below your purchase price, it's time to exit. No exceptions, no hope, no "it'll come back."
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