“The future is not hidden.
It is unfinished.”
This essay is the first in a short series exploring what it means to trade the present rather than the past.
A race is not won by driving at the average speed of the track.
That fact feels obvious in motorsport. Yet in markets, the same mistake is made with remarkable sophistication. Traders study the past, calculate what worked on average, and attempt to reproduce that speed in a future that has not yet revealed itself.
The problem is not ignorance. It is misapplied certainty.
Markets, like race tracks, are not given all at once. They are disclosed sequentially. One corner appears. Then the next straight. Then a surface you have never driven on before. The future is not unknown in the abstract. It is unknown in a very specific way. It is incomplete.
And this is precisely where backtest-led thinking quietly fails.
The Seduction of the Completed Track
A backtest offers something deeply comforting. It shows you the entire circuit.
Every corner is visible. Every straight has a measured length. There are no blind crests. No surprises. The track is finished, closed, and internally consistent. You can drive it again and again in your mind, refining speed until it feels right.
This sense of completion is intoxicating.
The backtest does not merely show performance. It implies closure. It suggests the problem has been solved, that uncertainty has been tamed, that the correct speed exists and has been discovered.
But this completeness is an illusion created after the fact.
The future market is not a completed object waiting to be driven. It is a partial revelation unfolding in real time. Optimising for a finished track trains you to expect coherence where none is guaranteed. It teaches you to drive with confidence precisely when humility is required.
This is why so many strategies feel robust right up until the moment they fail. They were calibrated for a world that had already made up its mind.
Why Average Speed Loses Races
Average speed feels sensible because it feels fair. It smooths experience into a single number. It promises consistency. It reassures.
But no race is decided by fairness.
A driver who enters a sharp corner carrying the average speed of the lap does not survive the corner. A driver who lifts on a straight because the average speed has already been achieved does not win the race.
Markets punish the same behaviour.
When risk is sized to historical calm, corners arrive too fast. When profits are taken because results look good enough, long straights are abandoned prematurely. The pursuit of smoothness quietly replaces responsiveness, and rigidity replaces control.
Average speed is not conservative. It is careless.
Convexity Is Not Designed. It Is Expressed.
Convexity is often treated as something that can be engineered. Adjust the parameters. Shape the payoff. Optimise the skew.
But convexity does not originate in a spreadsheet. It originates in behaviour.
To express convexity is to accept, in advance, that most moments will be uncomfortable. It is to live with frequent small losses without trying to eliminate them. It is to remain exposed when gains feel large, extended, and psychologically unjustified.
Traders who believe they are designing convexity often do the opposite. They optimise away drawdowns until fragility is hidden. They cap upside because it looks anomalous. They seek confirmation that the environment resembles the past before allowing themselves to participate fully.
What they have designed is not convexity. It is a story about control.
Convexity, properly understood, is not a feature of the model. It is a stance toward uncertainty. It is expressed through how a system responds when conditions change, not how it performed when conditions were known.
Brakes and Acceleration Are How Convexity Lives
This is where the racecar analogy stops being illustrative and becomes literal.
Brakes are not predictions. They are commitments. They exist before the corner appears. They define how much damage is acceptable when conditions deteriorate. They are rule-based responses to present information, not intuitive judgments about the future.
Acceleration is the same. It is not bravado. It is permission. Permission to remain exposed when structure persists. Permission not to interfere simply because outcomes feel extreme or unfamiliar.
Together, brakes and acceleration allow the trader to engage fully with the present moment.
When volatility rises, new positions are entered smaller.
When structure deteriorates, exposure falls through exits.
When trends persist, positions are maintained.
When losses occur, they are accepted quickly.
When gains arrive, they are not negotiated away.
This is not intuition. It is design expressed through response.
The Corners and Straights You Have Never Seen
The most important sections of any race are the ones you did not practice.
The corner that tightens more than expected.
The straight that extends far longer than precedent suggests.
These moments decide outcomes.
Backtests, by construction, cannot prepare you for them. They can only tell you how similar situations resolved in the past. Convexity does not depend on similarity. It depends on survivability and openness.
Small losses keep you in the race.
Uncapped gains reward you for staying.
Outliers are not forecastable. They are encountered.
Only traders who remain solvent through unfamiliar corners are still accelerating when unprecedented straights appear.
Control Is the Real Edge
This is the quiet truth beneath every robust trading system.
The edge is not prediction.
It is not optimisation.
It is not smoothness.
The edge is control under uncertainty.
Brakes prevent ruin.
Acceleration preserves opportunity.
Average speed does neither.
Markets do not reward those who drove fastest in history. They reward those who can still drive when the track changes.
Convexity is not a curve on a chart.
It is not a statistic in a backtest.
It is the ability to navigate what exists now.
Full stop.
With thanks to David Dredge, whose racing analogy helped crystallise the ideas explored here.