←2026-08-25 · Herbert Simon
Analysis
Many financial crises are not caused by markets collapsing on their own. They are caused by policymakers trying too hard to prevent them from doing so.
The consensus explanation for the latest bout of violent volatility in U.S. Treasuries is straightforward: Treasury Secretary Scott Bessent has expanded long-dated bond buybacks to stabilize the market, suppress yields, and restore liquidity.
That is the official story.
Strip away the packaging, however, and the picture becomes far more dangerous. This intervention may do little to repair the structural fault lines in the Treasury market. Instead, it could destabilize the existing equilibrium, awaken the bond market’s long-dormant nightmare scenario, and puncture one of the most expensive U.S. equity markets in modern history.
The entire chain of events began with a disorderly surge in long-term Treasury yields.
The 30-year yield recently spiked to an intraday high of 5.33%, its highest level since 2007. That was the immediate catalyst for Bessent’s emergency market-stabilization measures.
The selloff, however, was not driven by fiscal concerns alone. The escalation of the U.S.–Iran conflict and rising tensions in the Strait of Hormuz pushed oil prices higher, creating a dangerous combination of renewed inflation pressure and deteriorating U.S. fiscal credibility.
The Treasury’s response was blunt: double the size of each long-dated bond buyback operation from $2 billion to $4 billion. Beginning on September 9, the Treasury would purchase 10- to 30-year securities directly in the secondary market, attempting to force down long-term yields and restore market liquidity.
Most investors interpreted the move as a powerful backstop. But that view fails to distinguish between two fundamentally different phases of the market.
During the initial phase of the Treasury selloff, the primary driver was rising real yields.
The underlying logic was straightforward: America’s fiscal position continued to deteriorate, the federal debt burden kept expanding with little discipline, and geopolitical tensions were adding fresh upside pressure to energy prices. Investors were simply repricing the risk of holding long-duration U.S. government debt.
Yet the market still had one critical anchor: inflation expectations remained firmly contained.
Global investors could criticize America’s fiscal deficits and mounting debt load, but they continued to accept one fundamental premise—that the Federal Reserve retained both the institutional capacity and the political independence required to deliver on its 2% inflation target.
Fed credibility and central-bank independence were the bedrock of global asset pricing.
The bond market’s true nightmare has never been rising real yields alone.
The real danger is a simultaneous shock:
Real yields remain elevated and continue climbing, while inflation expectations become completely unanchored.
If inflation expectations break above the critical 2.5% threshold while real yields remain high, the 10-year nominal Treasury yield could move decisively above 5%. At that point, the Federal Reserve would have few viable options. It could be forced to replay the 2022 tightening cycle—aggressive rate hikes, rapid liquidity withdrawal, and broad financial-condition tightening.
That is the malignant feedback loop capable of destabilizing both bonds and equities. And it is precisely the risk that Bessent’s rescue operation may inadvertently bring to life.
To be clear, this is a scenario analysis, not an established fact. The data below show how far current market conditions remain from that nightmare—and where the first warning signs may already be emerging.
Every macro thesis must ultimately survive contact with the data.
First, the timeline: August 18 was the day the 30-year Treasury yield reached its 5.33% high. The Treasury formally announced the expanded long-bond buyback program on August 19.
Following the announcement, the key indicators moved as follows:
The 10-year breakeven inflation rate rose modestly from 2.27% on August 14 to 2.30% on August 19—an increase of roughly three basis points. That is not an inflation-expectations “surge,” and the measure remains comfortably below the 2.5% warning threshold. But the direction matters. Inflation expectations showed an initial sign of loosening, suggesting that investors had begun paying a premium for the tail risk of fiscal-deficit monetization.
The 10-year TIPS real yield fell from 2.41% on August 18 to 2.35% on August 19. Yet it remained near the upper end of its range over the past two decades, with no evidence of a meaningful or sustained decline.
The nominal 10-year Treasury yield retreated from an intraday high of roughly 4.75% on August 18 to around 4.63%–4.66% following the announcement, before rebounding into the 4.69%–4.74% range.
Inflation expectations edged higher while real yields remained structurally elevated. Attempts to push long-term nominal yields lower repeatedly failed.
The market was casting a vote of no confidence in the Treasury’s intervention.
Much of the financial press stopped at the surface: the buyback program had failed because yields briefly declined and then rebounded.
That interpretation confuses the outcome with the underlying driver.
The source of the renewed rise in yields may already be shifting. This is no longer merely a fiscal-risk story expressed through higher real yields. It is beginning to look like an inflation-risk repricing triggered by policy intervention itself.
ING’s assessment was brutally concise: the move amounted to rearranging the deck chairs on the Titanic.
The market’s deeper concern is now taking shape.
When the Treasury uses administrative power to suppress long-term yields, it interferes with market-based price discovery. Yet one rule of macro markets remains difficult to escape:
Without coordination from the Federal Reserve, the Treasury has almost no credible ability to impose genuine yield-curve control.
From there, the market’s ultimate risk scenario becomes clear:
The Treasury insists on suppressing long-term yields → its policy tools prove insufficient → the intervention fails → political pressure forces the Federal Reserve to capitulate → the Fed restarts quantitative easing to support the Treasury market → monetary inflation returns and the U.S. dollar weakens.
That is the deeper logic behind the violent post-announcement rallies on August 19 in GLD gold (+3.5%), SLV silver (+3.7%), and Bitcoin (+6%). Capital began pricing the tail risk of renewed monetary inflation before that risk had fully materialized.
The macro narrative is therefore starting to change—from pricing fiscal deterioration to testing a new regime defined by policy failure and unanchored inflation expectations.
Such a shift would strike directly at the Federal Reserve’s two most valuable assets: credibility and independence.
The result would be a structurally higher-volatility, higher-risk macro environment.
Many investors have compared the Treasury’s latest move with the post-crisis Operation Twist of 2011, treating it as a familiar and proven stabilization tool.
That comparison is fundamentally flawed.
The two operations emerged from opposite macroeconomic regimes. The current version is therefore likely to deliver diminishing returns from the moment it begins.
The basic mechanism is straightforward.
Beginning September 9, the Treasury will purchase $4 billion of 10- to 30-year securities in each operation. The government has not officially disclosed how those purchases will be financed, but the market broadly expects the Treasury to rely primarily on additional issuance of short-term Treasury bills.
That detail is not trivial.
T-bills already account for approximately 22.2% of outstanding Treasury debt, exceeding the 20% ceiling recommended by the Treasury Borrowing Advisory Committee. The Treasury’s remaining room to fund long-bond purchases through additional short-term issuance is already limited.
The economic substance of the operation is simple: it does not reduce the total federal debt burden. It merely shortens the duration of America’s liabilities by replacing long-term debt with short-term debt.
This is a liability-management exercise, not debt relief.
The 2011 Operation Twist—in which the Federal Reserve exchanged approximately $400 billion of short-term securities for longer-dated bonds—worked because it rested on two crucial foundations:
A favorable macro environment: The global economy was operating in a disinflationary, if not outright deflationary, regime. There was little risk of inflation expectations becoming unanchored.
Full monetary-policy coordination: The Federal Reserve was supporting the system through quantitative easing, while near-zero interest rates kept short-term government financing costs exceptionally low.
It is also worth remembering that today’s Federal Reserve chair, Kevin Warsh, publicly questioned QE2—the Fed’s $600 billion bond-purchase program—at the time and had longstanding reservations about aggressive monetary accommodation, even though he ultimately voted in favor of the program.
The effectiveness of the 2011 policy depended entirely on the combination of disinflation and monetary easing.
In 2026, every one of those conditions has reversed.
There is no monetary-policy coordination. The current program is being implemented unilaterally by the Treasury. The Federal Reserve is not participating, and there is no accompanying QE program. Administrative intervention cannot substitute for monetary accommodation.
The macro regime is the opposite. The economy is operating in an inflationary environment, not a deflationary one. A policy designed for the post-financial-crisis era is being deployed in conditions for which it was never built.
The risk structure is deteriorating. Shortening the duration of federal debt leaves the government increasingly exposed to fluctuations in short-term interest rates—and therefore increasingly vulnerable to Federal Reserve policy.
This creates the possibility of an extremely destructive feedback loop:
Inflation expectations rise above 2.5%, potentially reaching 3% → the Federal Reserve responds with aggressive rate hikes → the yield curve becomes deeply inverted, with short-term rates above long-term yields → the Treasury must issue short-term debt at punitive funding costs → it uses that expensive funding to repurchase lower-yielding long-term bonds → federal interest expense accelerates exponentially → the fiscal position spirals further out of control.
In plain English, today’s rescue operation may be laying the groundwork for tomorrow’s debt crisis with remarkable precision.
Combining the policy structure, market data, and macro backdrop produces two directional conclusions. These remain scenario-based judgments rather than certainties.
The Federal Reserve has little room to support the Treasury’s version of Operation Twist.
In an inflationary environment, direct central-bank support for the bond market could detonate inflation expectations. The result would be a logically incoherent policy mix in which the Fed attempts to inject liquidity through QE while simultaneously fighting the resulting inflation through aggressive rate hikes.
That combination is neither sustainable nor politically credible.
At the same time, the rise in yields is showing early signs of evolving from a real-yield-only move into a dual shock driven by both real yields and inflation expectations.
Real yields are already near two-decade highs. Breakeven inflation expectations are drifting higher. If the latter continue moving toward 2.5%, a break above 5% in the 10-year Treasury yield would become an increasingly probable outcome.
The long-term forces behind this pressure are difficult to reverse:
First, America’s fiscal deficits continue to widen, while the federal debt problem remains unresolved. That creates a structural bias toward higher, not lower, real yields.
Second, deglobalization continues to raise production costs, while geopolitical conflict keeps energy prices vulnerable to repeated shocks. These forces create a persistent source of endogenous inflation that cannot be eliminated through rhetoric or temporary market intervention.
The S&P 500’s cyclically adjusted price-to-earnings ratio, or CAPE, currently stands at approximately 40 to 42 times earnings, with readings across major data providers ranging from roughly 40.4 to 42.6.
That places U.S. equity valuations near their highest level since the peak of the dot-com bubble, when the CAPE ratio reached approximately 44.
This valuation structure depends heavily on the assumption that long-term interest rates will remain contained.
If the 10-year Treasury yield establishes itself above 5%, the equity market will face an aggressive valuation reset. Price-to-earnings multiples would contract, capital would rotate away from expensive risk assets, and U.S. equities would become vulnerable to large-scale liquidation and a deep correction.
That is the great irony of Bessent’s intervention.
The policy was designed to prevent market instability and support asset prices. Yet it may ultimately become the catalyst for a simultaneous release of risk across both Treasuries and equities.
There are no simple, linear causal relationships in American capital markets.
Whenever policymakers attempt to manufacture short-term stability by overriding the underlying laws of supply, demand, and price discovery, the market eventually retaliates—usually with greater force.
Fiscal indiscipline and administrative interference in market pricing do more than create short-term volatility. They erode confidence and destroy the anchors on which the entire pricing system depends.
Once investors stop trusting policy stability and central-bank independence, they will begin pricing every major tail risk simultaneously: uncontrolled inflation, an unsustainable debt burden, and a breakdown of institutional credibility.
That is the central lesson of the latest Treasury-market crisis.
The greatest danger in capital markets is rarely the market’s natural adjustment process. It is the intervention designed to prevent that adjustment.
The policy presented as a backstop may ultimately become the fuse that detonates the entire risk complex.