Adverse Selection Cost
Adverse Selection Cost — Loss MM suffer when trading against informed counterparties.
Definition
Adverse Selection Cost refers to loss MM suffer when trading against informed counterparties. Keep that definition fixed when comparing series, managers, or regimes — renaming the same tape does not create a new signal.
Why it matters
Price formation at the venue layer decides whether a signal survives implementation. When loss MM suffer when trading against informed counterparties 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 adverse selection cost is saying. If loss MM suffer when trading against informed counterparties 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
Measure spread, queue, and impact at your size; paper fills are not a desk edge. Prefer a short written null hypothesis for Adverse Selection Cost: what would falsify the current reading in the next window?
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