Risk, Ruin & the Size of the Bet — TraderzLife Education Series Book 7
LEVEL 4 · THE TRADER · BOOK 7
The earlier books were about one question: do I have an edge? — answerable only slowly, statistically, and never with confidence. Book 5 said only your own record can settle it. Book 6 said the same.
This book is about the other question, and it has a completely different character. How much should I stake? is answerable today, with arithmetic, before you place another trade — and the choice is yours to make.
An edge with the wrong size can still end in ruin. No edge with the right size usually produces a slow, survivable decline you can notice and stop. If you can only get one of the two questions right, get this one right.
- Why percentages do not average — +50% then −50% is not break-even, it is a quarter of the account gone, and variance is a cost rather than a discomfort
- The recovery curve: d ÷ (1 − d), and why a 50% drawdown needs at least 70 winners in a row at 1%
- When the order of your trades starts to matter — percentage sizing, a drawdown limit, and the largest barrier of all, which is you
- One person over time is not a thousand people at once: the coin game with a positive expected value that reliably sends an individual towards zero
- Ruin, computed — how often a 25% drawdown arrives within a year of trades on a 55% edge: 0.36% of years at 1% risk, 20% at 2%, 88% at 4%. Risk is an exponent, not a dial
- Kelly, and why nobody trades it — for a solid 55% edge at 1:1 the optimal stake is 10% of the account; half Kelly buys about 75% of the growth for a quarter of the variance; twice Kelly earns roughly nothing
- How many bets do you actually have? Four positions correlated at 0.6 are about 1.4 bets, and swing together like one position 3.3 times the size
- Five layers of limit: per trade, per theme, total open, drawdown steps, and the stop — ten seconds per trade
- One year, twice: same edge, same trades, same order. At 4% the trader is stopped on trade 94 — while still up 28% on the year
- Your own ruin audit — one page of arithmetic on your own numbers
Tested, not just taught. Every table was computed from the formula or simulation printed beside it. The two claims about markets were checked on recorded prices with our own data systems: major dollar pairs really do behave like one and a half bets, not four, and losing trades really do cluster, so real drawdowns run deeper than simple simulations suggest. The method and its limits are printed in full.
Six full-colour diagrams, a risk card, full notation, a glossary and sources. Assumes only the books before it.
Next: Book 8 — the gap between the plan and the person executing it.
Instant PDF download, 105 pages, in colour, readable on phone, tablet or desktop.
Educational purposes only, not trading or financial advice. Most retail CFD accounts lose money; trading leveraged products carries a high risk of losing your money.