Newsig · MarketWatch
Why mortgage bonds are set to deteriorate, and possibly hit the whole market, according to this Wall Street expert
A flattening Treasury yield curve is part of the problem for mortgage-backed securities, says Harley Bassman.
Why it matters
TLT (20+ Year Treasury) · Why linked: Discussion of Treasury yield curve flattening directly impacts long-duration Treasuries. Market context: A flattening curve and MBS deterioration could pressure long-end Treasuries; bearish for TLT.
SPY (SPDR S&P 500 ETF) · Why linked: The headline suggests potential broader market spillover from MBS weakness. Market context: MBS deterioration hitting the whole market could weigh on equities; bearish but secondary impact.
How TLT, SPY usually react
This story is too recent for its own reaction record — we score each asset against the actual price move 24h after publication. These are the long-run figures across every event we have tracked for them.
| Asset | Events | Avg max move | Closed lower |
|---|---|---|---|
| TLT | 9 | +0.62% | 67% |
| SPY | 10 | +0.67% | 70% |
Curated by Newsig — News in. Signal out.
How the reaction data is measured · Editorial policy