NextFin News - The 10-year U.S. Treasury yield climbed to 4.78% on Tuesday, its highest level since January 2025, while the 30-year yield hovered near 5.27%, the highest since 2007. Yet global stocks kept marching toward record territory: the MSCI All-Country World Index sits near an all-time peak, and the S&P 500 closed at a record 7,798.99 on August 13, up roughly 14% this year. The question is no longer whether bonds are broken. It is whether equities are right to ignore them.
This is the central tension of the moment. The bond market is pricing in a world of stubborn inflation, swelling fiscal deficits, and a government borrowing program so large it prompted the U.S. Treasury to intervene directly. The stock market is pricing a world in which artificial-intelligence-driven earnings growth outruns every increase in the discount rate. Both cannot be right forever. For now, earnings are winning — but the transmission channel from yields to equity valuations is already opening, and it runs through the mortgage market, the corporate refinancing wall, and the very AI buildout that is fueling the rally.
The Selloff Is Global, and It Is Accelerating
The move is not confined to the United States, and that breadth is what separates it from an ordinary rate wobble. Australia's 10-year government bond yield jumped as much as 10 basis points to 5.19%, the highest since July 2011, with its three-year yield up seven basis points to 4.73%. Japan's 10-year yield crossed 2.99%, a level last seen in 1996, while the 30-year reached 4.19%. In Europe, the 10-year British gilt yield hit 5.21%, up five basis points, and the 30-year gilt reached 5.86%, its highest since 1998. Germany's 10-year Bund yield rose to 3.33%.
Behind these moves are three forces that arrived at once. First, Federal Reserve Chairman Kevin Warsh struck a deliberately hawkish tone in his August 28 keynote at the Jackson Hole symposium, telling policymakers the central bank still has "work to do" to bring inflation under control. The message moved markets fast: the odds of a September rate hike rose to 57.5%, up from 35.4% a day earlier, according to the CME FedWatch Tool. "Overall, it was a deliberately hawkish speech that will put to rest any concerns about the Fed's willingness to raise rates to restore price stability," wrote Vail Hartman, a U.S. rates strategist at BMO.
Second, renewed strikes in the Iran conflict pushed oil prices higher, reviving the specter of sticky inflation just as the July FOMC minutes warned that higher rates may be needed if price progress stalls. Third, the fiscal backdrop deteriorated on the same day the Treasury announced its intervention: the national debt passed $40 trillion for the first time, reaching $40.05 trillion as of August 19, according to the Treasury Department.
The policy response has been unusually direct. On August 20, Treasury Secretary Scott Bessent announced the department would at least double the size of its government debt buyback program, running from September 9 through November 4, with the 30-year bond as the primary focus. Yields initially tumbled — the 30-year fell about 10 basis points after touching its highest level in roughly 19 years — but the relief did not last. By the following day, the 10-year yield had given back more than five basis points of the announcement move, and the 30-year was back above 5.2%. The market's verdict was swift: a buyback funded by a department with a finite balance sheet cannot offset a structural supply problem.
Why Stocks Have Looked Through the Bond Selloff
The equity market's calm is not irrational, and dismissing it as complacency misses what is actually supporting prices. The earnings backdrop is genuinely strong. The S&P 500's blended net profit margin for the second quarter is running at 17.0%, according to FactSet — above the first quarter's 14.8%, the year-ago 12.9%, and the five-year average of 12.4%. That is the highest level in data going back to 2009. Nine of 11 sectors are reporting margins above their five-year averages, led by Communication Services at 28.6%, Consumer Discretionary at 16.5%, and Information Technology at 32.3%. Only Health Care and Real Estate sit below their averages.
More importantly, the beat rate is extraordinary. With 97% of S&P 500 companies having reported, 86% have topped EPS estimates — well above the five-year average of 78% and the highest positive-surprise rate since the second quarter of 2021. In aggregate, earnings are coming in 26.5% above estimates. This is not a multiple-expansion rally built on hope; it is a profit-led rally built on delivered results. When margins expand while revenue holds, higher discount rates hurt less, because the numerator growth offsets the denominator risk.
"The inflation picture at the moment isn't enough to derail what really remains an earnings-driven market," said Bill Merz, head of capital markets research at U.S. Bank Asset Management. That view captures the bull case precisely: as long as profits grow faster than discount rates rise, the equity math still works.
There is also a compositional point that matters. The rally is concentrated in the companies funding the AI buildout — the same companies whose capital spending is helping drive the bond selloff. Technology and communication services are both the demand side of the AI capex boom and the biggest beneficiaries of it in the equity market. As long as investors believe that spending will generate returns, the narrative is self-reinforcing: capex drives earnings, earnings support stocks, and stocks validate the capex.
The Transmission Mechanism: How Higher Yields Actually Reach Equities
The conventional wisdom is simple: higher yields mean higher discount rates, which mean lower present values for future earnings, which means lower stock prices. That chain is correct as far as it goes, but it is also already priced into the conventional view. The more important transmission channels are the ones the market talks about less.
The first is the consumer channel. The 30-year fixed mortgage rate is running at 6.77%, up from about 6.6% earlier in August. Mortgages do not price off the 10-year Treasury directly, but they move with it, and every 100-basis-point rise in mortgage rates removes a meaningful slice of household purchasing power. That eventually shows up in consumer discretionary revenue — the very sector that is among the margin leaders this quarter. The lag between bond yields and consumer spending is long, which is why the effect has not yet appeared in the data. Long lags are what make the risk easy to ignore right up until it is not.
The second channel is the refinancing wall. Higher long-term yields do not just raise the cost of new borrowing; they freeze existing balance sheets. Companies that issued debt at lower rates now face a choice between refinancing at materially higher coupons or delaying investment. This is where the AI narrative meets the credit market. High-grade corporate bond issuance has surged to $1.681 trillion through July, up 26.9% year over year, according to SIFMA data. Bank of America expects another $190 billion of investment-grade supply in August, up from $164 billion the prior month. Some of that issuance is funding AI data centers and chips; some of it is simply refinancing what matured.
The third channel is the crowding-out effect, and it is the one that ties the whole story together. Investors have a finite appetite for duration risk. When the Treasury is issuing record volumes of long-dated debt, the national debt has crossed $40 trillion, and corporations are simultaneously flooding the market with AI-funded supply, the price of bearing that risk — the term premium — has to rise. That is precisely what we are seeing in the 30-year bond. The term premium is, in effect, a fear tax on holding long-duration risk, and it is being levied by three borrowers at once: the federal government, the corporate sector, and, through mortgage-backed securities, the American household.
The interventions "belie the underlying structural challenges and do nothing to address them," Maia Crook, a senior research analyst at JPMorgan Chase, wrote in a client note. "While [Wednesday's] action forced some decline in longer-dated yields, the more lasting impact is the potential for higher risk premia reflecting a Treasury Department that is intervening in the market and moving away from its 'regular and predictable' tenet."
Cyclical Shock or Structural Regime Shift?
This is the judgment that determines everything else, and the answer is that both forces are at work — but they operate on different horizons. Getting this wrong flips the conclusion.
The cyclical leg is real and could reverse. The oil spike is a function of a geopolitical conflict that could de-escalate. The Warsh shock was a single speech, and markets often overreact to central-bank communication before settling. The Treasury buyback, while small relative to the deficit, did produce a measurable if temporary decline in long yields. If inflation prints cool over the next two months and the Fed signals that the Jackson Hole hawkishness was risk management rather than a new reaction function, the 10-year could easily trade back toward 4.3% to 4.5%. In that scenario, the bond selloff was a cyclical scare, and equities were right to look through it.
But beneath the cyclical noise, the structural leg is stronger, and it is the one that should worry equity investors. Three conditions that kept the post-2008 regime intact have changed. First, the fiscal arithmetic has shifted: the United States is running large structural deficits in a period of full employment, which means debt is growing even without a crisis to justify it. Second, the Federal Reserve is no longer a reliable buyer of last resort for long-dated Treasuries — the post-pandemic balance-sheet runoff means the private sector must absorb more supply. Third, the AI capex boom has created a new, persistent competitor for long-duration capital that did not exist in previous tightening cycles.
History offers a warning about how this ends. In the 1994 bond rout, the Fed raised its policy rate from 3% to 5.5% and 10-year yields finished the year roughly 150 to 350 basis points higher. In 2022, the 10-year yield rose from about 1.5% to above 4% while the S&P 500 fell about 20%, and the correlation between stocks and bonds turned positive — the diversification that portfolios relied on evaporated exactly when it was needed. Today's setup differs in one crucial respect: earnings are strong now, whereas in 2022 margins were already under pressure. That difference is what is buying the equity market time. It is not buying it immunity.
The Strongest Case Against This View
The most serious counter-argument is that this entire analysis mistakes a healthy normalization for a crisis. The bull case runs as follows: the economy is growing, corporate profits are at record margins, unemployment is low, and the AI investment cycle is a genuine productivity shock that will expand the economy's capacity rather than just inflate asset prices. In that world, higher yields are not a threat to stocks — they are a symptom of stronger nominal GDP growth, and equities have historically performed well in moderate-growth, moderate-inflation environments. The Treasury buyback, properly understood, is not panic but prudent liability management that smooths the maturity profile and supports market functioning. And the Fed's hawkishness is simply a return to credibility after a period of excessive dovishness — exactly what bond investors said they wanted.
This case has force, and it is backed by the earnings data above. But it rests on one assumption that the bond market is refusing to make: that the fiscal deficit will be brought under control without a sharp adjustment. The structural bull case for equities requires the numerator — earnings growth — to keep outrunning the denominator — discount rates — indefinitely. That is possible if AI delivers a productivity boom. It is not the base case, because productivity gains take years to show up in aggregate data, while higher coupon payments show up immediately on the income statement.
The falsifying signal for the view laid out here is specific and observable: if the 10-year Treasury yield sustains a move above 5.0% while the S&P 500's forward earnings estimates for the next four quarters are revised downward for two consecutive months, the transmission mechanism has moved from theory to reality, and the equity rally's foundation is cracking. A cleaner version of the same test: if the 30-year mortgage rate holds above 7.25% into the fourth quarter and existing-home sales fall more than 10% annualized, the consumer channel has activated, and the "look-through" thesis is wrong.
What to Watch, and Who Is Exposed
In the short term — the next one to three months — the direction of the market will be set by the September Federal Reserve decision and the next two inflation prints. With the post-Jackson Hole reading of the CME FedWatch Tool near 57.5% for a September hike, any dovish surprise would trigger a relief rally in both bonds and stocks. The base case is continued volatility with an upward bias in yields, as the fiscal supply calendar dominates the cyclical data.
Over the medium term — six to twelve months — the earnings cycle becomes decisive. If third- and fourth-quarter results show margins holding near record levels while revenue growth persists, the equity market can absorb another 50 to 75 basis points in the 10-year yield without a material drawdown. If margins begin to compress as refinancing costs roll in, the correlation between stocks and bonds will turn decisively positive, and the diversification benefit that has supported the rally will vanish.
In the long term, the structural question resolves around fiscal policy and AI productivity. If the deficit path bends toward sustainability and AI delivers measurable productivity gains, today's yield levels will look like a mid-cycle pause. If neither happens, the market is entering a higher-term-premium regime that will compress equity multiples across the board, with the longest-duration growth stocks most exposed.
The exposed parties are clear. Highly leveraged companies facing a refinancing wall, rate-sensitive sectors like real estate and utilities, and long-duration growth names that depend on distant cash flows carry the most risk. The beneficiaries, if the soft-landing narrative holds, are the cash-rich technology leaders funding the AI buildout, financials that earn more on higher rates, and energy companies if oil remains elevated. But that beneficiary list assumes the earnings cycle stays intact — and that is the assumption the bond market is testing.
The bond market is not asking whether AI is real. It is asking whether the government can fund its deficits and corporations can fund their AI ambitions without someone accepting a lower price for their risk. Stocks have answered "yes" by reaching new highs. The next few months will show which market is pricing reality, and which is pricing hope.
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