Central Bank QE/QT — Bond Demand Regime
Quantitative easing (QE) transforms central banks into the dominant marginal buyer in sovereign bond markets.
When the Federal Reserve, European Central Bank, Bank of Japan, or Bank of England purchases government bonds at scale, they create a price-insensitive buyer that absorbs supply regardless of yield level.
This artificially suppresses yields below where they would clear in a purely market-driven environment, creating the foundation for broad financial asset appreciation.
The mechanism operates through three channels:
(
- direct price support — central bank buying reduces available supply in the secondary market, bidding up prices and compressing yields; (
- portfolio rebalancing — investors crowded out of sovereign bonds seek yield in corporate bonds, equities, and real assets; (
- signalling — QE commits the central bank to a low-rate stance, anchoring term premium.
QT reverses all three channels simultaneously. **Example 1:
** 2020–2021 peak QE — Federal Reserve purchased $120B in bonds per month ($80B Treasuries, $40B MBS).
US 10-year yield was held in the 0.5–1.5% range despite record fiscal deficits ($3T+ annual) that would normally require higher yields to attract buyers.
Without Fed buying, consensus estimated yields would have been 150-200bps higher. **Example 2:
** 2022 QT reversal — Fed began quantitative tightening at $95B/month pace while simultaneously hiking rates 425bps.
US 10-year yield rose from approximately 0.5% to 5.0% — the sharpest one-year yield rise since the 1980s.
Long-duration bond index fell more than 20%.
ECB QT beginning contributed to European sovereign spread widening.
Thresholds:
Fed purchasing $80B+/month = significant yield suppression, duration risk elevated;
QT $100B+/month = structural headwind for long-duration bonds;
ECB/BOJ QE still active = divergence trade opportunity between global bond markets.
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