Higher costs are becoming the environment.

Persistent inflation, WTI around $99–100, retail diesel above $6.50 and weak demand for Treasury duration increasingly resemble an operating regime. The decisive move through 5% in the 10-year yield strengthens that interpretation. QQQ's sharp late recovery on September 24 remains an important counter-signal: equities are still absorbing the pressure.

The environment, and the market's response

On September 23, McDonald's CEO Chris Kempczinski told CNBC that his team should stop describing conditions as a difficult environment and recognize “that is the environment.” He added, “we’re not expecting things to change,” and described inflation as sticky across the world. His comments concern restaurant operating conditions, but the broader investment question is familiar: how much of today's cost pressure should companies treat as persistent?

The Treasury sequence matters. The 10-year initially retreated from the 5% area. Following stronger PMI data, and with WTI holding around $100, it subsequently accelerated decisively through that threshold. HER4's contemporaneous TradingView observations on September 24 reached approximately 5.22% on the 10-year and 5.50% on the 30-year. These are dated intraday observations, not closing yields or a continuously updating web feed.

The speed and character of the move are consistent with investors requiring greater compensation for persistent inflation, financing supply and nominal growth. That is an interpretation, not a claim that any one factor explains the entire repricing.

Diesel transmits the pressure

WTI around $99–100 was part of the same September 24 market observation. Diesel provides a more direct connection to operating costs: EIA's September 21 national retail average was $6.529 per gallon, up 24.4 cents in a week. This is an economy-wide transmission mechanism through trucking, agriculture, construction and distribution. Businesses must absorb higher costs in margins, pass them through in prices, or reduce activity. Households face the resulting pressure on purchasing power.

Duration demand deserves its own attention

Recent auction quality has been weak. The September 23 sale of $70 billion in five-year notes cleared at 5.033%, approximately 3.1 basis points above the pre-auction when-issued yield, with a 2.21 bid-to-cover ratio. That combination indicates buyers required additional yield to absorb the offering. Auction tails, indirect demand, dealer allocations and the subsequent yield response now deserve close attention.

On September 24, Treasury bought approximately $4.08 billion of 20–30-year bonds, against $10.47 billion offered and a $6 billion maximum. Treasury characterizes these buybacks as liquidity support. They are not Federal Reserve QE, and yields remaining high does not establish a failed rescue. Nevertheless, the 30-year remained near 5.50% after the operation, amid long-end yields near multi-decade highs. Liquidity support and the yield required to attract duration buyers are distinct questions.

QQQ is meaningful contrary evidence

In HER4's September 24 intraday observations, QQQ was weak for much of the session, then recovered sharply and traded positive late despite the rates and oil backdrop. That resilience deserves weight. It shows that investors continued to buy growth and technology exposure under demanding financing conditions; it does not establish that equities must soon reverse or that higher costs are harmless.

Greater consequences, with probability still conditional

Higher rates, oil and diesel do not by themselves prove an immediate equity break. They can increase the consequences if a break occurs. Sustained pressure can also eventually affect its probability through refinancing costs, higher discount rates, weaker margins, deteriorating collateral values and loan-to-value ratios, and strained consumer budgets.

For SPY and QQQ, the focus remains the interaction between earnings durability and the cost of financing and valuing those earnings. The 10-year's 5.33–5.38% area is a technical reference to watch if yields advance further, not a target or prediction.

The combination increasingly looks like a persistent operating regime rather than a temporary shock. QQQ's resilience remains a substantive counterweight. The next evidence is whether companies and households continue absorbing these conditions, or whether refinancing, margins, credit and equity sensitivity begin to deteriorate together.

Previous issues

September 18, 2026 — The lines were crossed. The market held.

September 11, 2026 — Oil raises the stakes for earnings and valuations

HER4 Market Interactions is general market commentary, not investment advice or a recommendation to buy or sell any security. Views are as of the issue date and may change as conditions evolve.