Markets aren't driven by fundamentals alone — collective investor psychology plays a considerable role short term. Sentiment indices aim to capture this dominant emotional state, between fear and greed.
Widespread extreme fear generally means most sellers willing to exit have already done so — leaving less potential selling pressure, making the market statistically more likely to bounce. Extreme greed reflects the opposite.
Like any contrarian indicator, sentiment can sit at an extreme for an extended period before a reversal materializes, particularly during strongly established trends. It's a probabilistic context indicator, never a precise timing signal.
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