When the 30-year Treasury yield spiked to 5.337% earlier this week, marking its highest level since 2007, the global "pricing anchor" for assets underwent its most aggressive repricing in decades. Just as concerns mounted over uncontrolled long-term borrowing costs, Treasury Secretary Scott Bessent dropped a bombshell by at least doubling the size of liquidity support repurchase operations for 10-to-30 year Treasuries from $2 billion to $4 billion per operation. This move quickly compressed long-end yields, with the 30-year yield plunging nearly 10 basis points to 5.18% within hours of the announcement.

However, Bessent's "market rescue" triggered a chain reaction across global foreign exchange markets, pushing the Bloomberg Dollar Index to a three-month low while the Japanese yen, Swiss franc, and New Zealand dollar emerged as the biggest winners. A comment from Deutsche Bank's chief Japan fixed income strategist Akio Omori nailed the market's interpretation: "The Treasury can buy back its own bonds, but it cannot buy back the dollar."

A Policy Pivot From Predictability to Interventionism

The Treasury announced Wednesday it would raise the cap on liquidity support repurchase operations for 10-to-20 year and 20-to-30 year nominal coupon Treasuries from $2 billion to at least $4 billion, with the new rules taking effect September 9 and lasting through November 4, the end of the current refunding quarter. The timing itself sent a powerful signal, arriving just two weeks after the Treasury's quarterly refunding announcement. Natixis US rates strategy head John Briggs noted that if this plan had been unveiled in a routine statement, the market reaction would have been far less intense, but "the choice of timing now shows that officials did not like what was happening."

Omori dubbed Bessent "the most interventionist Treasury secretary in decades," pointing out that the move marks a clear departure from the Treasury's long-held "regular and predictable" debt management principles. Ironically, Bessent criticized former Treasury Secretary Janet Yellen in 2024 for adopting similar strategies—increasing short-dated bill issuance to lower long-term financing costs—arguing that it amounted to artificially influencing the market. Now he appears to be walking the same path. Citigroup stated bluntly: "In our view, this move is intended to control long-end yields rather than to maintain normal market functioning." Wall Street is calling this a "covert Operation Twist" in substance, echoing the Fed's post-crisis tool of buying and selling different maturities of Treasuries to depress long-term rates.

The Dollar Pays the Price for Lower Yields

Bessent's repurchase operations are pushing the dollar into an awkward position. Jefferies International chief European economist Mohit Kumar believes "any form of yield control will weaken the dollar." Singapore family office Reed Capital's chief investment officer Gerald Gan stated directly: "The dollar is undoubtedly the biggest victim." He believes Bessent is deliberately suppressing long-term real interest rates and signaling tolerance for a weaker dollar to sustain economic momentum. Gan said he will "further diversify investments and reduce reliance on the dollar."

Franklin Templeton's Melbourne-based fixed income head Andrew Canobi cut through the ambiguity: Bessent is "effectively saying we are prepared to sacrifice a little bit of dollar strength in exchange for keeping term yields broadly under control." He added, "There has to be a release valve." The Bloomberg Dollar Index fell roughly 0.8% on Wednesday and hovered near three-month lows on Thursday, with the DXY index briefly touching 98.708. Options market data shows traders' first reaction was to add dollar short positions, with demand for euros and pounds strongest. ING strategist Chris Turner noted that the Treasury's decision to increase long-dated bond repurchase volumes "removes one of the major threats to risk assets this summer," but the dollar has come under pressure as a result.

Evercore ISI strategists pointed out that "Bessent would welcome these currency moves because the Trump administration has been touting the benefits of a weaker dollar," arguing this helps improve US competitiveness and narrow the trade deficit.

A Complete Policy Picture: From Yen Intervention to Long-End Yield Suppression

Washington's recent policy combinations are reshaping long-term market confidence in the dollar. Just weeks ago, the US coordinated with Japan on its first joint yen-buying intervention since 1998. Bessent has also hinted at potentially using Federal Reserve tools to finance subsequent interventions if necessary. Now, with long-end bond repurchases adding "yield control" to the mix, a broader policy picture is emerging: Washington appears increasingly willing to trade market intervention for controlled borrowing costs. Traders will likely interpret this as an attempt to suppress market pricing of US fiscal sustainability and Fed inflation-fighting credibility.

State Street Global Advisors' senior fixed income strategist Masahiko Loo noted that while the dollar remains supported in the short term by AI-driven US equity inflows and rising oil prices, the latest measures reinforce the long-term narrative of de-dollarization and currency depreciation. As sovereign AI initiatives and data center construction spread beyond the US, "the special capital inflow advantage the US enjoys today may gradually erode." Overseas demand for US Treasuries is cooling in tandem. Treasury data released Monday showed foreign investors held $9.299 trillion in US debt as of June, with Japan—the largest foreign holder—cutting holdings by $26.4 billion to $1.116 trillion for the month.

Structural Limits of Buybacks: Temporary Painkiller or Pandora's Box?

Although Bessent's intervention has stabilized the bond market in the short term, Wall Street remains broadly skeptical of its long-term effectiveness. Annex Wealth Management's chief economic strategist Brian Jacobsen called the move a "temporary painkiller," noting "we are in an era of fiscal dominance and modern monetary expansion." He warned further: "The Fed is powerless to influence long-term rates. Now the Treasury will issue more short-term debt because demand for long-term debt is weak. Even if the Fed raises rates, the Treasury is effectively injecting more money-like short-term debt into the economy."

Brandywine Global Investment portfolio manager Jack McIntyre was more direct: "What truly lowers long-term rates is an economic slowdown or resolution of the Iran conflict—I'm not sure we're there yet." The fundamental drivers pushing Treasury yields higher remain unchanged: a projected $1.9 trillion fiscal deficit, inflation persistently above the Fed's 2% target, and an AI-driven corporate bond flood competing with government debt for investors. Deutsche Bank's George Saravelos described this as "mild financial repression."

The 'Bessent Put' Boosts Carry Trades and Opens a Window for Alternative Assets

In the wake of dollar weakness driven by Bessent's operations, alternative assets are finding new opportunities. Omori expects the yen to be the biggest beneficiary over the next three to six months. Recent Washington moves have eliminated two factors that previously weighed on the yen: Japan's need to sell US Treasuries to finance interventions, and pressure from rising US long-term yields. He also favors gold, followed by the Swiss franc and euro as alternatives to the dollar. Market data confirms this trend—the yen, Swiss franc, and New Zealand dollar were the biggest gainers against the greenback on Wednesday, and gold received an immediate boost following the buyback announcement. Analysts suggest traders are likely viewing this as an attempt to suppress market pricing of US fiscal sustainability and Fed credibility, providing structural support for alternative assets.

Emerging Market FX Index Hits Record High

Meanwhile, emerging market currencies hit record highs as dollar weakness boosted the appeal of popular carry trades, offsetting the impact of a fresh surge in oil prices. The Treasury's announcement of increased government bond repurchases weakened the dollar, boosting so-called carry trades by making the greenback cheaper as a funding currency for investments in higher-yielding emerging market currencies. "The Bessent put—or the fact that someone is watching over the US Treasury market—removes one of the major threats to risk assets this summer and should keep carry trade strategies popular," said ING's global markets head Chris Turner.

The MSCI Emerging Market Currency Index rose 0.2%, advancing for a second consecutive session. The Thai baht led gains, climbing 0.6% to a two-month high, while the Philippine peso rebounded from record lows. The Czech koruna was the best-performing currency in the EMEA region. Elsewhere, the Indonesian rupiah hit a two-month high against the dollar. Commerzbank noted that FTSE Russell's decision this week to delay adjustments to stock indices eased a potential equity-related headwind for the rupiah. The Jakarta Composite Index was among the world's best-performing stock indices on Thursday. Commerzbank economists Henry Hao and Moses Lim wrote in a report: "FTSE may still reduce the weight of limited free-float shares in September, but this decision temporarily delays the risk of those stocks being downgraded to frontier market status."

The Korean won lagged other major currencies this week after touching an 11-month high the previous session. Meanwhile, Korean stocks posted their first gain of the week, with the KOSPI index recording its largest single-day advance this month. Samsung Electronics and SK Hynix were the main drivers behind a 2% rise in the MSCI Emerging Markets Stock Index, fueled by expectations of record shareholder returns. Taiwan Semiconductor Manufacturing Company also rose, with the stock serving as another heavyweight in the index and a key beneficiary of the AI boom.