On the day of a crash, how does a human fail to react? Half an hour after the open, the index is plunging, and in the fastest, worst few minutes a person is watching the screen, hesitating, telling himself this time is different. By the time the decision is made, the worst stretch is already over. In extreme markets, what lags is never the judgment. It is the reaction.
So the judgment has to be written down in advance. There is a self-built automated defense system for extreme markets: the trigger conditions become rules, and once a rule fires, short positions in stock-index futures go on automatically. Nobody needs to be there to press the button. The point of the system is to use automated hedging tools to compensate for the reaction lag of manual trading in extreme conditions, and to hold the line on principal.
In July 2021, the A-share market fell hard. The system automatically used index-futures shorts to absorb the shock of the extreme swings, and one set of fund curves made a new high that month. A new high in a falling market does not come from predicting the move precisely. It comes from rules written long before, waiting for exactly that day. There is nothing dramatic here: a rule fires, the shorts go on, the shock is absorbed. The drama belongs to the market; the calm belongs to the design.
Three objections await. Take them one at a time.
The first is the most direct: a black swan happens in an instant, so how can rules written in advance cover a market nobody has seen?
The objection sounds forceful but aims at the wrong target. What the rules cover is not any specific market scenario. It is reaction speed as such. What is slow in a human is the reaction, not the judgment — so the judgment gets written into the rules in advance, and execution takes over from there. The shock of extreme volatility lands on the slow. The market scenario may never have been seen before, but slowness as a variable has been seen plenty.
The second objection sounds more practical: the shorts hang there all year, a pure drag in a bull market; better to stay fully invested and save the cost.
What gets saved is exactly the insurance premium. The cost of hedging is visible every day; its value is invisible until the extreme day arrives, because the point of a floor is only redeemed once. The person who resents the shorts as a drag in a bull market and the person who regrets having no hedge when the crash comes are often the same person.
The third objection pulls the rug: index futures have high thresholds, ordinary accounts cannot play, and this whole apparatus has nothing to do with retail investors.
What is irrelevant is the tool. What is relevant is the principle. Before an extreme market arrives there are only three roads: hold a hedge, hold cash, or cut exposure early. Occupying any one of the three counts as having defense designed into the portfolio. Occupying none of them is what actually makes a portfolio irrelevant to defense. The tool can be missing; the design cannot.
The edges deserve stating too. This system does not predict black swans; it hedges their impact. The rules govern reaction speed, not directional judgment. If the direction itself is wrong, no hedge rescues the judgment. And none of this is a call on today’s market — the July 2021 episode is cited for the mechanism, not as a forecast.
The saddest cases are the people who treat holding through a crash as courage: sitting motionless as it falls is not composure, it is having no alternative — and mistaking having no alternative for composure is the most expensive illusion there is.
Back to the start. An extreme market does not test whose judgment is more accurate. It tests whose reaction is faster — and speed is not trained on the spot; it is designed in advance. Defense is the same. It is designed, not endured.
