SHORT ANSWER
The core idea
Swap spreads move because government-bond supply, bank balance-sheet costs, repo conditions, derivatives demand and credit factors change relative pricing between swaps and sovereign bonds.
THE MECHANISM
What is happening underneath
They can become negative, showing that the old assumption of a permanently positive spread is unreliable.
MARKET INTERPRETATION
How investors should read it
The move is often structural rather than a simple credit signal.
BONDSTATS TAKEAWAY
The same market move can carry different information depending on which maturity, issuer and risk premium is changing. Read the question together with the underlying concepts rather than treating one price move as a universal signal.
RELATED CONCEPTS
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