Position Size Follows Certainty, Not Nerve

CONTENTS

Two investors equally bullish on one company can hold positions differing tenfold. Where does the gap come from? Not nerve — different answers to one word: certainty. One system puts it bluntly — the first question of allocation is not what looks promising, but how certain it is. Position size is a function of certainty, not of courage. That sounds like a tautology; in practice it is a ladder, every rung matching a level of certainty.

Five rungs, one certainty each

The system ranks assets from the bottom up. Rung one: deeply discounted cigar-butt stocks, Graham-style hard-asset bargains with limited downside and the highest certainty of value returning — these earn the heavy core position, and only stocks meeting this standard deserve one. Rung two: solid, high-quality leaders. Good companies, genuinely expensive: they sit on a watchlist, waiting for sector-wide bad news and a deep pullback, standing aside while the stock is fashionable. Rung three: high-volatility sectors — where the common shares are unholdable, convertibles stand in, or index funds carry the exposure. Rung four: emerging frontiers, defined without softening: not traditional value investing but an industrial option bet, handled the way options are handled — small stakes, diversified, losses accepted. Rung five is the minefield: heavy goodwill, fully pledged major shareholders, persistently negative cash flow, businesses detached from the core — avoided in full, never opened. Separate discipline caps any single position; one line is enough here. And assets that cannot be understood? The ladder has no rung for them. That absence is the answer.

Good companies deserve buying — why all the rankings

The first objection is the most direct: scoring certainty is subjective, so why not spread money evenly across quality assets? The argument has a hidden premise — that all assets carry the same kind of risk. A discounted cigar butt and an industrial option are two different risk containers: one floored by its discount, the other living on its odds. Even splitting erases exactly that difference. Certainty does not decide whether to buy; it decides the ceiling of the position. The most certain asset takes the heaviest weight; the most lottery-like takes a lottery-sized slot. The ordering is not taste. It is arithmetic.

Why not just hold the leader the whole way up

Second objection: a good company parked on a watchlist while it runs away — how does that make sense? Should the leader not simply be held? The system’s rule is written down and inflexible: wait for bad news, wait for the deep pullback, wait for a discount — and watch from the sidelines the whole time the stock is popular. A watchlist position is not a refusal to study the company; it reserves the buying right for the discount. A good company bought too dear becomes a different kind of gamble. Good company is not the same as good price — that is another ledger, and one boundary line is all it gets here.

Should emerging industries not take heavy bets

The loudest objection comes last: emerging industries deserve heavy early conviction, a light position amounts to no position, and option thinking is timid. The system’s own definition stands in the way: this is an industrial option bet, and an option means small stakes, diversification, and accepting the loss. Bet on an option as if it were a core holding and the odds structure inverts — winning is a small-probability windfall, losing a high-probability wipeout. A heavy bet proves nothing about conviction; it only proves nobody priced the bet. In the hottest phases of a market, the people hurt worst carry a lottery slot on their backs as if it were a core position. The system cannot save everyone who wants to gamble; it only keeps the ladder standing.

The position table measures certainty, not confidence

Return to the gap of ten. It is not a difference of temperament but a difference of two position tables: one ranked by certainty, one ranked by mood. This system forecasts nothing. It manages one thing — standing heaviest where certainty is highest, standing light where a loss must be accepted, not standing at all where nothing can be understood. Certainty is the rung of the ladder: plant a foot firmly on one before stepping up to the next. A tenfold difference in position size deserves neither envy nor mockery. Spread out any portfolio, and ask of every single holding: can its level of certainty actually be answered?

Fengyu WANG
Fengyu WANG

Markets, investing, engineering — one person, one underlying logic.