U.S. Treasury markets reversed the effects of an expanded buyback program within a day, with the 30-year yield rising 0.01 percentage point to 5.28% and the 10-year yield climbing 0.03 point to 4.73% on the 21st. Both exceeded Wall Street's thresholds of 5.0% and 4.5%, respectively. Treasury Secretary Scott Bessent said on the 19th that long-dated Treasury buybacks would double from $2 billion to at least $4 billion per operation from the 9th of next month through November 4, covering 10-20 year and 20-30 year maturities, and later said, "we have many policy tools." Investors viewed the move as a temporary fix because each $4 billion operation equals only 2.4% of outstanding 10-30 year Treasury debt. The Dollar Index (DXY), a measure of the dollar against six major currencies, fell to 98.80, its lowest level in approximately 100 days, raising concern that policy intervention could weaken the dollar without capping yields. Structural pressures include U.S. national debt above $40 trillion, higher oil prices linked to the prolonged Middle East conflict, and rising corporate bond issuance tied to the AI investment boom. The source also highlights renewed Federal Reserve rate-hike expectations, a sixth straight day of oil gains, coordinated U.S.-Japan yen intervention that failed to stabilize long-term yields, and uncertainty across gold, Bitcoin and related equities. It concludes that volatility may intensify as the midterm elections approach and the administration considers more aggressive measures if stabilization efforts fail.