Tools chosen: kalshi_direct kalshi_related fred code_execution claude_news polymarket_related

Sub-questions (Fermi decomposition)

Planner reasoning

This is a 2031 annual real GDP growth bucket question resolving in early 2032 — far outside any forecastable news cycle, so the answer should be driven by (a) the Kalshi market's own prices across all buckets in the KXGDPYEAR-31 event, and (b) a historical base rate of US annual real GDP growth falling in the 2.1–2.5% band, adjusted toward long-run CBO/Fed potential-growth projections (~1.8–2.1%). Cross-bucket prices let me check normalization and de-vig; FRED gives the historical distribution; code_execution turns that into a probability.

# Event Kalshi market KXGDPYEAR-31-B2.3: resolves YES if US real GDP growth in 2031 falls between 2.1% and 2.5%. # Outcomes to forecast - Yes (2031 real GDP growth in [2.1%, 2.5%]) - No (outside that range) # Kalshi market anchor Current YES price: **15%** (up from 5% low, +10pts in 7 days, +4pts in 30 days; avg daily volume ~1,306 contracts over 8 days of data). Price is rising sharply and near its high (17%). This is the consensus to beat. # Sub-question answers 1. **Current price/movement** — 15% YES, up +10pts (7d) and +4pts (30d), range 5–17% over 8 data points; strong recent upward momentum. [kalshi_direct] 2. **Other buckets in KXGDPYEAR-31 event** — Not directly retrieved; kalshi_related returned no other 2031-year buckets (only 2035/2036 buckets from different years: 2036 "2.6-3.0%" at 5%, 2035 "1.6-2.0%" at 14%). Cannot confirm full 2031 distribution sums to ~1; data gap. 3. **Historical bucket frequency** — Empirically, 1948-2024: 13.0% of years in 2.1-2.5%; post-1985: 17.5%; post-2000: 28.0%; post-2010: 46.7% (small n). Recent decades show much higher hit-rate than full history. [code_execution] 4. **Official long-run projections for 2031** — CBO (Jan 2025): ~1.8% average 2027-2031, with potential GDP growth 1.8% for 2031-2036 (below bucket). Fed SEP longer-run: 2.0% (just below bucket lower bound). IMF WEO: trajectory easing toward ~1.7-1.8% by 2030. All three cluster at 1.8-2.0%, below/at edge of the 2.1-2.5% range. [claude_news] 5. **Nearer-term Kalshi GDP-year buckets (sanity check)** — Only 2035 (1.6-2.0%, priced 14%) and 2036 (2.6-3.0%, priced 5%) buckets found; no 2026-2030 data retrieved. Limited comparability; suggests market centers distribution lower (~1.6-2.0% bucket priced comparably to 2.1-2.5%), consistent with institutional forecasts below 2.1%. 6. **Std dev / distributional fit** — Post-1985 sd=1.74pp, post-2000 sd=1.83pp. Normal-fit P(2.1-2.5%) ≈ 8.7-9.0%; CBO-anchored scenarios (mean 1.8-2.2%, sd 1.2-1.5) give ~9-13%. Fat-tailed (t-dist) slightly lower. [code_execution] # Key facts (high-confidence, factual) 1. [claude_news/CBO] CBO Jan 2025: real GDP grows ~1.8% avg 2027-2031; Jan 2026 report: potential GDP growth 1.8%/yr for 2031-2036 (down from 2.1% in 2026-2030). 2. [claude_news/Fed] Fed SEP longer-run real GDP growth stable at 2.0% (Mar/Jun 2026). 3. [claude_news/IMF] IMF WEO Oct 2025: growth easing to ~1.8% by 2030. 4. [FRED A191RL1A225NBEA] Last 5 annual growth rates: 2021: 6.2%, 2022: 2.5%, 2023: 2.9%, 2024: 2.8%, 2025: 2.1% (2025 falls exactly in bucket). 5. [code_execution] Empirical bucket hit-rate rising over time: 13% (1948-2024) → 17.5% (post-1985) → 28% (post-2000) → 46.7% (post-2010, small n). # Cross-market signals - Kalshi related: 2036 bucket "2.6-3.0%" priced 5% (declining trend); 2035 bucket "1.6-2.0%" priced 14% (rising, similar trajectory to this market) — suggests market may be pricing a slightly-below-2.0% central tendency for the 2030s, consistent with institutional forecasts. - Polymarket: No matching GDP markets found — no cross-check available. - Sportsbook: N/A (not applicable to economic data market). # Analyst opinions and speculation - code_execution synthesis suggests blending empirical (15-47%) and parametric (9-13%) estimates points to a "true" probability in the **~15-20%** range — notably above current Kalshi price's starting point but roughly in line with where it has now risen to (15%). - Institutional forecasters (CBO/Fed/IMF) consensus points to growth landing just below the bucket (1.8-2.0%), implying the modal/median outcome is more likely "No," but the bucket is close enough that meaningful probability mass falls within it under realistic forecast-error distributions. # Directional lean per outcome - **Yes (2.1-2.5%)**: Supporting — recent actual 2025 growth (2.1%) sits exactly at bucket's lower edge; post-2000/2010 empirical base rates much higher (28-47%) than full-history rate; Kalshi price rising fast (5%→15%) suggesting new information or repricing toward higher probability. Opposing — CBO/Fed/IMF median forecasts (1.8-2.0%) sit just below the bucket; parametric/normal distribution fits give only 9-13%; this is a narrow (0.4pp) bucket, inherently low base-rate over 8-year horizon with substantial forecast uncertainty by 2031. - **No**: Supporting — all three major institutional forecasts cluster below the bucket (1.8-2.0%); narrow bucket width mathematically caps maximum probability even if distribution is well-centered; long forecast horizon (5+ years out) implies wide uncertainty band, diluting any single narrow bucket's share. Opposing — empirical hit rates in recent decades (28-47%) undercut a strict "No" bias if history is the guide; Kalshi's own sharp upward repricing (+10pts in a week) suggests market participants are updating toward Yes. # Gaps / unknowns - Full 2031 Kalshi bucket distribution (all buckets, e.g., <1.5%, 1.6-2.0%, 2.6-3.0%, >3.0%) not retrieved — cannot verify de-vig sum to ~1 or locate modal bucket price. - No 2026-2030 nearer-term Kalshi GDP-year bucket data retrieved for direct comparison/sanity check. - Reason for Kalshi's sharp 7-day/30-day price rise (news catalyst?) not identified in research — could reflect a data release, revised forecast, or thin-volume noise. - No Polymarket cross-check available. # Calibration anchors - Kalshi current YES price: **15%** (up from 5%, strong momentum) — primary anchor. - Empirical base rates: 13% (all-time), 17.5% (post-1985), 28% (post-2000), 46.7% (post-2010, n=15). - Parametric/normal-distribution estimates centered near institutional forecasts (1.8-2.2% mean, 1.2-1.5 sd): ~9-13%. - Blended estimate per analyst synthesis: ~15-20%.

1. Both forecasts converge tightly (16%/17%) essentially clustering around the Kalshi price without seriously grappling with the "gaps/unknowns" section — neither flags that the full 2031 bucket distribution wasn't retrieved, meaning they can't verify whether 15% is even a coherent, de-vigged probability rather than a mispriced/thin-volume artifact (avg volume only ~1,306 contracts, 8 data points). 2. Neither forecaster interrogates *why* the price jumped +10pts in 7 days — the brief explicitly flags this as unexplained ("news catalyst? data release? thin-volume noise?") and momentum-chasing on a thinly-traded contract 5+ years from resolution is a weak basis for anchoring; this should have widened uncertainty rather than been treated as informative signal. 3. Both treat the empirical base-rate acceleration (13%→17.5%→28%→46.7%) as mildly supportive without addressing the reference-class problem: the post-2010 sample is n=15 with likely serial correlation (multi-year growth regimes), and this trend could simply reflect a shrinking-post-2008 "new normal" band rather than a stable structural rate — using it as directional support without discounting for small-n/autocorrelation is an overweighting. 4. Neither considers tail/regime-shift scenarios for 2031 (recession, AI productivity boom, major fiscal/trade shock) that could push actual growth far outside the narrow 0.4pp band in either direction — given an 8-year horizon, both forecasts implicitly assume a fairly stable central-tendency world matching current CBO/Fed baselines, understating volatility from business-cycle timing (a recession year or a snap-back boom year in 2031 would swing growth well outside 2.1-2.5%). 5. Both forecasts settle at nearly identical values (16% vs 17%) despite claiming independent reasoning, and both anchor almost entirely on the Kalshi price plus a light nudge toward the empirical support — neither seriously tests whether institutional forecasts clustering at 1.8-2.0% (below the bucket) should pull the estimate toward the lower end of the 9-13% parametric range instead of the higher blended 15-20% range, given that CBO/Fed/IMF are arguably the highest-quality, most decision-relevant inputs available. 6. Neither forecaster addresses the cross-market signal that the 2035 "1.6-2.0%" bucket is priced at 14% while this "2.1-2.5%" bucket is priced at 15% — if markets expect the 2030s growth distribution to center below 2.0% (as institutional forecasts suggest), the 2031 bucket being priced similarly or higher than the lower-range bucket seems internally inconsistent and worth flagging as a potential mispricing rather than confirmation.

14% (59% confidence)

Yes: 14% No: 86%

The Kalshi anchor (15%) is thin (~1,306 contracts/day, 8 data points) with an unexplained +10pt weekly jump, so it deserves less deference than a liquid market; the critique's point that momentum on a contract 5+ years from resolution should widen rather than sharpen belief is well taken. The most decision-relevant inputs — CBO (~1.8%), Fed longer-run (2.0%), IMF (~1.8%) — all sit just below the bucket's 2.1% floor, and parametric fits with realistic 8-year-ahead forecast error (sd ~1.3-1.8pp) put a narrow 0.4pp window at only ~9-13%. The recent-decades empirical hit rates (28-47%) are based on tiny, serially correlated samples spanning an unusually stable expansion era and shouldn't be weighted heavily, especially given real recession/boom tail risk for 2031. The cross-market oddity (2035's 1.6-2.0% bucket at 14% vs this at 15%) also hints the 15% may be slightly rich relative to a below-2% central tendency. I therefore settle modestly below both forecasts and the market, at ~13.5% Yes.

Total pipeline time: 116.9s