Market Impact Model
Market Impact Model — Price response to order flow used in optimal execution and capacity estimates.
Definition
Market Impact Model refers to price response to order flow used in optimal execution and capacity estimates. Keep that definition fixed when comparing series, managers, or regimes — renaming the same tape does not create a new signal.
Why it matters
It shows up in factor research, attribution, and capacity debates — whether a return slice is skill, style, or fee drag. When price response to order flow used in optimal execution and capacity estimates shifts, related hedges, limits, and narratives usually need an explicit update rather than a quiet assumption.
Case
Suppose a desk is positioned for the opposite of what market impact model is saying. If price response to order flow used in optimal execution and capacity estimates moves against that book, the first question is not “is the story clever?” but whether size, hedges, and stop logic still match the observation.
How to read it
Check definition stability across universes, costs, and regimes before treating a backtest as portable. Prefer a short written null hypothesis for Market Impact Model: what would falsify the current reading in the next window?
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