Calibrated to the Headline: The Cost of a Reaction Function No One Can Write Down

Market Note · Fed Reaction · 2026

The market-implied path, repriced print by print

2-year Treasury yield, daily close, June 2026

Jun 9 close (pre-CPI)

4.13%

Post-FOMC peak

4.24%

Latest close

4.14%

2-year Treasury yield

Source: Federal Reserve Economic Data (FRED), BLS, BEA. Author’s calculations.nikkhosravipour.com

In the four weeks between June 10 and July 2 the market moved its estimate of the Federal Reserve's policy path four times. A hot May inflation print opened the sequence on June 10.¹ A week later the Federal Open Market Committee held the funds rate steady while raising its median projection for year-end 2026 from 3.4% to 3.8%, erasing the cut it had penciled in March and putting a hike on the table.² The May PCE release carried the energy spike the Middle East war has put into prices. On July 2 the June employment report landed on the other side of the ledger: payrolls grew by just 57,000, less than half what forecasters expected.³ Figure 1 traces the two-year Treasury yield through all four.⁴ It jumped on the projections, held the gain for a week, surrendered it by the PCE release, and rebuilt it before the payroll miss clipped it back.⁵ Each turn is the market repricing the same policy rate on new information, four times in a month.

The prints themselves pull in opposite directions, and the tension is visible once the inflation number is taken apart. In its June statement the Fed attributes elevated inflation in part to supply shocks that have driven price increases in energy, a claim the decomposition in Figure 2 supports as far as it goes. Energy prices rose 24.3% over the year to May, against 4.1% for the headline index, and the gap between headline and core is the wedge that spike drives.⁶ The alibi ends at core. Core PCE inflation stood at 3.4% in May, 1.4pp above target. In June wage growth ticked up to 3.5% while hiring came in at roughly half the expected pace. No war explains core inflation at that level. A labor market where pay accelerates as hiring stalls is a picture of an economy whose inflation no longer arrives from outside.

Market Note · Fed Reaction · 2026

Headline, core, and the energy wedge

PCE price indexes, year-over-year, monthly

Headline PCE YoY

4.1%

Core PCE YoY

3.4%

Energy PCE YoY

24.3%

Headline PCECore PCEEnergy PCE

Source: Federal Reserve Economic Data (FRED), BLS, BEA. Author’s calculations.nikkhosravipour.com

A framework exists that is built for exactly this reading. The productivity norm, developed in its modern form by Selgin, directs the central bank to stabilize nominal spending and to let genuine supply shocks pass through to the price level, on the argument that a price change reflecting real scarcity is information the economy needs rather than an error the central bank should fight.⁷ Under that logic the war premium in energy is a relative price change requiring no monetary response; tightening against it would compound a real loss with a nominal squeeze. That energy case rests on the norm's demand-stabilization logic, and the same logic reads core inflation above 3% alongside accelerating wages as a different object, a signal of nominal spending running ahead of capacity, the one movement the norm instructs the central bank to correct. Core and wages are proxies here, since the norm targets nominal spending directly and the second-quarter spending data does not yet exist. Shrinking labor supply is itself a movement the norm would partly accommodate, so the assignment carries real ambiguity at the margin. The dual-mandate tension the June data created survives under the norm, but as an assignment: ignore the energy print, answer the core trend, and read the payroll number for what it says about spending instead of as a standalone verdict.

The assignment is the point, and it is what discretion cannot supply. A rule of this kind sorts releases in advance into those the central bank will answer and those it will ignore, and the sorting is public. Under any regime the expected path moves when genuine news arrives about the state of the economy; a rule removes one layer only, the uncertainty about how the committee will map that state into a rate. Markets holding the norm would have stripped the energy contribution from the June 10 print and repriced the smaller demand signal inside it. Judging by the two-year yield, which barely moved that day, that signal was small. What followed added the second layer. The committee the markets actually face has committed to no mapping at all, so every release reopens the question of how it will be read, and the yield in Figure 1 tracks the committee's likely reading of the economy as much as the economy itself. It also moved on days with no release attached, in a month when term premium and safe-haven flows were pushing on the same series, so no single day carries the attribution cleanly. Taken whole, the window does: a month of swings in both directions, driven as much by re-estimates of the committee as by news about the economy.

Data dependence is nonetheless the defensible posture for the institution the Fed actually is. A committee holding a dual mandate and no binding framework should not ignore a 57,000 payroll print, and the June decision to hold while the projections tilted hawkish is a reasonable judgment on the evidence in front of it. Even the projections supply a path of sorts; part of the June repricing was markets aligning with the new 3.8% median. A forecast the committee may revise at any meeting still communicates a judgment, and carries no commitment about the next one, so the revision itself becomes the thing markets must price. The concession has a boundary. The cost of meeting-by-meeting judgment sits in the variance markets must carry between decisions, priced and repriced at every release, because nothing constrains where judgment lands next. Each decision taken alone is defensible. The sequence they form has no anchor. Data dependence is the honest name for discretion, and the honesty does not lower its price.

The July meeting offers a test that does not require waiting on the task forces Warsh set running in June.⁸ A committee developing an actual reaction function would begin saying what it will not respond to: which components of the next print it reads as supply and which as demand. A committee re-litigating the latest release will produce another paragraph of judgment and another repricing. One path marks the beginning of something markets can price in advance; the other is the pattern Figure 1 already records, and every print between now and the framework review's conclusion will extend it.

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Footnotes

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