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> As someone who works for a quantitative hedge fund, you wouldn't believe how many similar results I see of researchers showing a statistically significant predictor of stock market returns. Almost every single one of them is garbage.

Are you able to share any that aren't (or weren't) garbage?

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Here's a disappointingly simple and well known one: Momentum. It produces real, statistically significantly, excess risk-adjusted returns over an index.

The remarkable thing is that it has been well known for decades, and continues to work. Many fortunes have been made by systematically exploiting it.

Ones that aren't garbage are valuable! Until the rest of the market adjusts, and then they're garbage.

He could share past insights that are no longer relevant. I obviously don't expect him to give away a stock tip worth millions of dollars.

Exactly, there is no actionable publicly known indicator. Because the moment it becomes known by a large enough group of traders, it becomes useless.

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