Agency MBS Basis
Agency MBS Basis — Spread between MBS and hedging Treasury futures, a core RV monitor.
Definition
Agency MBS Basis refers to spread between MBS and hedging Treasury futures, a core RV monitor. Keep that definition fixed when comparing series, managers, or regimes — renaming the same tape does not create a new signal.
Why it matters
Duration, curve, and carry decide whether a macro view survives into P&L. When spread between MBS and hedging Treasury futures, a core RV monitor 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 agency mbs basis is saying. If spread between MBS and hedging Treasury futures, a core RV monitor 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
Always state the tenor and roll-down assumption; parallel-shift shortcuts hide curve risk. Prefer a short written null hypothesis for Agency MBS Basis: what would falsify the current reading in the next window?
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