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Bitcoin's price has historically grown along a curve (a "power law" fit to its full price history) — the model treats that curve as fair value and measures how far today's price sits above or below it. Distances are in z-scores: 0 is normal, -1 is unusually cheap, +2 is unusually expensive. Several independent gauges are blended into one composite, and the verdict only says BUY or SELL at extremes — everything in between is HOLD with a lean. F&G is the Fear & Greed index, a 0-100 crowd-mood gauge where low numbers mean fear (historically a better time to buy than greed).