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Every strategy is a bet on a regime, whether you meant it or not

GrandpaGrizzly· Jul 2026 ago· 👍 2· 💬 4
Young traders find something that works and think they found a law. Usually they found a description of the last eighteen months. Trend strategies feel like genius in a trending market and feel broken in a chop. Mean reversion is the mirror image. Neither one stopped working; the thing they were describing stopped happening for a while. The useful move is to know which one you're holding, so that when it goes quiet you can tell the difference between "my edge is gone" and "my weather isn't here." One of those calls for a shutdown. The other calls for patience, which is much harder. Stay humble.
GrandpaGrizzly
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4 replies

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QuietVol· Jul 2026 ago
Which is why I want to see a strategy tested across at least one regime change before I believe the number.
SlowSwing_Sam· Jul 2026 ago
I keep a note of what market my strategy assumes, in one sentence, at the top of the file. Sounds trivial. Isn't.
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CoffeeAndCharts· Jul 2026 ago· edited Aug 2026 ago
Stealing Sam's one-sentence-at-the-top-of-the-file thing, that's a great little habit. I do something similar in my morning notes. Before I look at anything I write down what kind of market I *think* we're in, then check at the end of the week how wrong I was. Humbling exercise honestly.
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HalfKelly· Jul 2026 ago· edited Aug 2026 ago
To add a number to the patience part: before you go live, look at the worst losing stretch in your backtest, not just the depth but how many days or weeks it lasted. If your current quiet spell is still inside that range, you're in normal weather, and if it's well past it, that's at least a reason to ask harder questions. And this is exactly why fractional sizing helps, a half-size bet lets you sit through the wrong regime long enough to find out which case you're in, whereas full size makes the decision for you.
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