Tools chosen: polymarket_direct polymarket_related kalshi_related fred claude_news gdelt_news code_execution

Sub-questions (Fermi decomposition)

Planner reasoning

This is a Polymarket question on whether the FOMC raises the upper bound of the fed funds target at any point from Dec 16, 2025 through the September 2026 meeting. The dominant driver is current market-implied policy path (fed funds futures / CME FedWatch), which currently prices cuts rather than hikes, plus inflation trajectory and FOMC composition/leadership changes in 2026. I anchor on the Polymarket price, triangulate with Kalshi Fed markets, and check inflation/rate data for any hawkish shock risk.

# Current state As of the latest data (~2026-08-27), the fed funds target range sits at 3.50%–3.75% (upper bound 3.75%, DFEDTARU/DFF, FRED), unchanged since the December 2025 cut. No hike has occurred in the Dec 16, 2025 → present window. The September 2026 FOMC meeting (the "listed meeting" this market resolves on) has not yet occurred; markets and Fed commentary point to elevated but sub-50% odds of a hike there. # Timeline of key events - 2025-12-XX: FOMC cuts rate 25bp (3rd cut of 2025) to 3.50–3.75% (confirmed, Chase/Fed). - 2026-05-13: Senate confirms Kevin Warsh as Fed Chair, 54-45, to succeed Powell (term starts 2026-05-15) (confirmed, Chase). - 2026-05 to 2026-07: FOMC holds rate steady at 3.50–3.75% across three consecutive meetings, including Warsh's first two as chair (confirmed, Chase). - 2026-06 (June FOMC/SEP): Dot plot turns hawkish — 9 of 18 officials project year-end 2026 rate above current range, 6 of those project two 25bp hikes; median projection jumps to 3.8% from 3.4%; Warsh abstains from submitting a dot (reported, statisticsoftheworld.com/Chase). - 2026-07-29: FOMC holds again but signals possible September hike; 3 of 12 voting members dissent in favor of hiking; market reportedly pricing two 25bp hikes (Sept + Dec) (reported, Chase/CNBC/Advisor Perspectives). - 2026-08 (ongoing): News coverage of Warsh's hawkish rhetoric, proposal to reduce meeting frequency, political controversy (Sahm/Burns-Nixon comparisons), Trump reportedly calling Warsh (rumored/reported, Yahoo/Forbes/Arkansas Democrat-Gazette) — signals contentious, high-attention environment but no new rate action confirmed. - 2026-08-27: Polymarket "Fed Hike by Sept 2026" priced at 33.5%, down sharply (-19pts) over trailing 30 days from a high of 65.5% (confirmed, Polymarket). # Event Will the Fed hike the fed funds upper bound at any point between 2025-12-16 and completion of the September 2026 FOMC meeting? # Outcomes to forecast Yes / No # Kalshi market anchor Kalshi-direct price was NOT returned in this research pull (only unrelated KXFEDFUNDSYEAR long-dated level markets, e.g., "Fed funds ≥4.75% end-2036" at 40%, "≥5.75% end-2035" at 17%, "≥1.25% end-2034" at 79% — none address the Sept 2026 hike question directly). Treat Kalshi YES price as unknown/gap; use Polymarket (33.5%, 7d +1%, 30d -19%, $935.8k volume) as best available cross-market anchor. # Sub-question answers 1. **Polymarket price/90d trend**: 33.5% currently, +1% over 7 days, -19% over 30 days; ranged 11%–65.5% over 90 days — sharp de-risking from a summer peak near 65% down to mid-30s (Polymarket). 2. **Current rate/FOMC bias post-Dec 2025**: Upper bound 3.75% (target 3.50–3.75%) after the Dec 2025 cut; bias has shifted from easing to a hawkish hold, with June 2026 SEP showing majority-adjacent hike expectations and July 2026 hints at a September hike plus 3 hawkish dissents (FRED, Chase). 3. **Futures/Kalshi-implied probabilities for 2026 meetings**: Direct Kalshi/CME data not retrieved; Advisor Perspectives (late July 2026) reports markets pricing two 25bp hikes, first in September, second in December 2026 — implying meaningfully >50% market-implied odds for a Sept move per that source, though this conflicts with Polymarket's 33.5% and skeptical sell-side views (see below). 4. **Inflation trajectory**: Core PCE (PCEPILFE) rose steadily from 126.7 (Aug 2025) to 130.7 (Jul 2026), core CPI from 329.7 to 336.8 over the same span — persistent upward drift. Headline CPI YoY inflation reported at 4.2% in May 2026, well above 2% target (Chase/Advisor Perspectives). T10YIE (10Y breakeven) is moderate at 2.32% (Aug 2026), not signaling extreme inflation panic despite elevated realized inflation (FRED). 5. **Historical base rate**: Since 1990, hikes within ~9 months of a rate cut are rare — per-meeting base rate ≈3.6%, per-cycle ≈12.5% (only the 1998 LTCM cycle reversed quickly); synthesized central estimate ~5–8% cumulative probability absent unusual conditions (code_execution analysis). 6. **Fed chair transition impact**: Powell succeeded by Kevin Warsh (confirmed 2026-05-13, sworn in 2026-05-15) in a historically divisive Senate vote. Warsh has signaled a hawkish "regime change" rhetoric, proposed fewer FOMC meetings, and presided over a hawkish dot-plot shift, but notably held rates in his first two meetings and abstained from the June dot plot — suggesting rhetorical hawkishness has not yet translated into action (Chase, Forbes, GDELT). # Key facts (high-confidence, factual) 1. [FRED] Fed funds upper bound = 3.75% as of Aug 2026; unchanged since Dec 2025 cut. 2. [Chase] Dec 2025 cut was the third of 2025, to 3.50–3.75%. 3. [Chase] Rate held at three consecutive meetings (post-Dec cut) through July 2026. 4. [Chase/statisticsoftheworld] June 2026 SEP: 9/18 officials project 2026 year-end rate above current range; median dot 3.8%. 5. [Chase/CNBC] July 2026 meeting: held, 3 dissents favoring hike, hints of September hike. 6. [Polymarket] Current YES-equivalent price 33.5%, down from ~65.5% peak. 7. [FRED] Core PCE/CPI both trending up through July 2026; headline CPI 4.2% YoY (May 2026). # Cross-market signals - Kalshi related: No direct Sept-2026-hike series found; only long-dated fed funds level markets (not directly comparable). - Polymarket: 33.5% YES, declining trend last 30 days despite hawkish Fed commentary — suggests market skepticism that hawkish talk converts to action. - Sportsbook implied: N/A. - Other: Advisor Perspectives (late July) claims markets pricing two hikes (Sept+Dec) — this conflicts with Polymarket's sub-50% pricing; likely reflects futures-market framing (rate expectations drift higher) vs. discrete-event prediction market, a reconciliation gap. # Analyst opinions and speculation - JPMorgan Wealth Management still expects Fed on hold through end-2026, against hawkish market chatter (Chase). - Claudia Sahm warns of Burns/Nixon-style politicized Fed under Warsh (Yahoo, rumored/opinion). - Reports of Trump calling Warsh directly raise political-pressure speculation, direction unclear (Arkansas Democrat-Gazette, rumored). - Forbes/Fool commentary frames Warsh as rhetorically hawkish but action so far limited to holds, not hikes. # Directional lean per outcome - **Yes (hike by Sept 2026)**: Supported by hawkish June dot plot, July dissents, elevated inflation (4.2% CPI), Warsh's hawkish rhetoric, reported futures pricing of Sept hike. Opposed by: Fed has held for three straight meetings including under Warsh, historical base rate of hike-after-cut is very low (~5-8%), Polymarket pricing declining to 33.5%, sell-side (JPM) skepticism, moderate T10YIE not showing panic. - **No**: Supported by strong historical precedent against quick reversals, declining Polymarket odds, structural inertia (holds already three times), and inflation breakevens not spiking. Opposed by: unusually explicit hawkish signaling (dissents, dot plot) uncommon this close to a hike scenario. # Gaps / unknowns - No direct Kalshi YES price retrieved for this specific ticker — primary anchor missing; forced to rely on Polymarket proxy. - No CME FedWatch/fed funds futures direct probabilities provided. - Unclear how much of "market pricing two hikes" (Advisor Perspectives) reflects genuine >50% Sept-hike odds vs. cumulative/expectations framing. - August/September 2026 developments (post-Aug 27) not covered — outcome may already be resolving imminently. # Calibration anchors - Polymarket proxy price: 33.5% (declining trend). - Historical base rate (hike within ~9mo of cut): ~5–8% central estimate, up to ~12.5% per-cycle. - Current elevated conditions (inflation, hawkish dots, dissents) argue for adjusting above historical base rate, but recent Polymarket decline argues against overweighting hawkish rhetoric.

1. Both forecasters anchor almost entirely on Polymarket's 33.5% without questioning why it's declining 19pts even as hawkish signals (June dots, July dissents) accumulated — this divergence between "market skepticism" and "increasingly hawkish Fed communication" deserves more scrutiny than a passing mention, since it could reflect either the market correctly discounting rhetoric or the market being behind on fast-moving news the brief itself says is incomplete post-Aug 27. 2. Neither forecast meaningfully engages with the Advisor Perspectives claim that futures markets are pricing two hikes (Sept+Dec), which if even partially true implies a Sept-hike probability well above 33.5%; both wave it away as a "framing gap" without estimating what fraction of that signal should update the estimate. 3. Both treat the ~5-8% historical base rate and the elevated-conditions Bayesian adjustment somewhat impressionistically, landing within 3 points of each other (31% vs 35%) without independently justifying why the adjustment from base rate to current estimate should be roughly 25-30 points rather than, say, 10 or 40 points — the reasoning is more narrative than quantitative. 4. Neither forecaster flags the "gaps/unknowns" point that post-Aug 27 developments are uncovered and the event may already be resolving imminently by the time of forecasting — given the close date of Dec 2026 and a Sept FOMC meeting likely already occurred or about to occur, this is a critical blind spot that could make the entire distribution stale. 5. Both largely ignore the political-pressure subplot (Trump reportedly calling Warsh, Sahm's Burns/Nixon comparison) as a potential wildcard that could push either toward a hike (political pressure for hawkish independence-signaling) or away from one (pressure to keep rates low) — this tail scenario is dismissed rather than weighted. 6. Neither forecast addresses the asymmetry that the question resolves YES if a hike occurs "at any point" in the window, not just at the September meeting itself — meaning a hike could technically have already occurred at an unscheduled or intermeeting move, which the brief doesn't rule out and neither model discusses.

33% (58% confidence)

Yes: 33% No: 67%

With no direct Kalshi price, Polymarket at 33.5% is the best anchor, and both forecasters landed essentially on it (31%/35%). The critique is fair that the futures-implied 'two hikes' framing and the unexplained 19pt Polymarket decline deserve more weight, but these push in opposite directions and roughly offset: futures 'pricing hikes' typically reflects expected-path drift rather than >50% odds on a specific meeting, while the decline plausibly reflects genuine information (cooling data or Warsh signaling patience) that the brief's post-Aug-27 gap can't adjudicate. The structural case for No remains strong — three consecutive holds including Warsh's first two meetings, a very low historical base rate for reversing a cut within ~9 months (~5-12%), and 10Y breakevens at a benign 2.32% — but the June dot plot (median 3.8%, 9/18 above range), three July dissents, and ~4% headline CPI justify a large upward adjustment from that base rate, which the market has already made. Intermeeting hikes are historically near-zero probability absent crisis and are effectively embedded in the market price, so I settle at ~33% YES, right at the cross-market anchor.

Total pipeline time: 203.7s