A quick one this week, but it might be the most important number you never calculate.

Here's the setup that stuck with me. A coin lands heads 55% of the time. You bet heads, win double, lose your stake. That's a 10% edge every flip — better than any casino. You'd think ruin is impossible.

Start with $100. Bet $20 a flip and your probability of going broke is about 37%. Same coin, same edge, but bet $10 a flip instead — ruin drops to about 13%.

Nothing about the strategy changed. Only the bet size. That's the whole insight:

Your edge decides how much you make. Your bet size decides whether you're alive to make it.

The reason this bites is the recovery asymmetry. Lose 20% and you need 25% to get back. Lose 50% and you need 100%. Lose 80% and you need 400%. Losses compound against you faster than gains compound for you, so a deep drawdown steepens its own climb back.

This is why betting more than Kelly is a trap — past a point, bigger bets lower your long-run growth AND raise your odds of ruin. You get poorer and more fragile at the same time.

What a disciplined trader does: fix risk per trade at a small, constant fraction — often 1–2% — and think in units, not dollars. Ask a single question before you size up: how many losers in a row can I take and still be standing? If the answer is under ten, you're too big. Give variance less room to kill you.

This is educational commentary, not personalized financial advice — size your own risk to your own situation.

The full breakdown, with the coin simulation running on screen so you can watch ruin appear, is here: https://youtu.be/jqDKiwfldMw

Trade the process, protect the downside, and let the edge do its slow work.

— Paragon Signals