Topic · Trading & Microstructure
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41 articles · 2 checkpoints · 36 deeper reads · 3 reference notes
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Liquidity is not one number. Kyle's three dimensions separate what it costs to turn around right now (tightness), how much size the book absorbs before the price moves (depth), and how fast it heals afterwards (resiliency).
Every observed tick is the efficient price plus a small trading-mechanics error. That error is harmless at daily frequency and catastrophic at tick frequency, where it makes realised volatility blow up and returns look artificially mean-reverting.
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