Unverified50% confidenceFactExact time
Alpha decay refers to the phenomenon whereby as more and more market participants discover and exploit the same type of signal, the excess return capacity of that signal is gradually arbitraged away, with the half-life of high-frequency factors potentially being only a few weeks to months.
1
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50%
Confidence
Long-term
Relevance
8/26/2026
First Seen
Sources
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