Tools chosen: kalshi_direct kalshi_related fred claude_news code_execution

Sub-questions (Fermi decomposition)

Planner reasoning

This asks whether US real GDP growth in 2030 lands in the narrow 2.6%-3.0% band. With a 5+ year horizon, forecasts rely on CBO/Fed/IMF long-run projections and historical distribution of annual growth rates. The Kalshi market price is the key anchor, supplemented by consensus long-run growth estimates and base rates.

# Current state This is a long-horizon bucket question: US real GDP growth in calendar year 2030 must land in the [2.6%, 3.0%] range for Yes. The resolving data point will be BEA's advance/revised annual GDP estimate, likely published early 2031. No 2030 GDP data exists yet; all evidence is forward-looking. # Timeline of key events - **2025-01 (confirmed):** CBO Budget & Economic Outlook projects ~1.8% avg real GDP growth through 2035. - **2025-10 (confirmed):** IMF WEO projects US growth at 2.0% (2025) and 2.1% (2026); no explicit 2030 figure. - **2025-12 (confirmed):** Fed Dec 2025 SEP shows 2026 growth at 2.3%; longer-run median ~1.8%. - **2026-06-17 (confirmed):** Fed June 2026 SEP shows 2026 GDP at 2.2%; longer-run ~1.8% unchanged. - **2026 (reported):** Kalshi 2030 GDP bucket B2.8 price surges from 8% → 17% over past 7 days (+9pp). --- # Event Will US real GDP growth in 2030 be between 2.6% and 3.0%? # Outcomes to forecast - **Yes**: 2030 annual real GDP growth ∈ [2.6%, 3.0%] - **No**: Growth falls outside this range # Kalshi market anchor **Current YES price: 17%** (KXGDPYEAR-30-B2.8) - 7-day change: **+9pp** (sharp recent surge from 8%) - 30-day change: +9pp (same move — very recent shift) - Avg daily volume: 2,722 contracts - Price range over data window: 8%–17% - ⚠️ Notable: this is a dramatic repricing that nearly doubled the implied probability in one week; may reflect thin liquidity / single large trade rather than broad consensus shift. # Sub-question answers 1. **Kalshi price for 2.6%–3.0% bucket?** — 17% YES, up +9pp in 7 days. [Kalshi direct] 2. **Long-run forecasts (CBO, Fed SEP, IMF) for 2030?** — CBO projects ~1.8% avg through 2035 [CBO Jan 2025]. Fed longer-run median ~1.8% [Fed SEP Jun 2026]. IMF shows ~2.0–2.1% through 2026 with no explicit 2030 figure. All three converge well below the 2.6% lower bound of this bucket. [news] 3. **Historical distribution / frequency of 2.6%–3.0% band?** — Empirically, 6/40 years (1984–2023) landed in band = 15.0% raw frequency. Normal model fits give 7%–9.2% depending on mean assumption. Post-GFC (2010–2023): 2/14 years = 14.3% empirical, but model-based ~8.5%. [code_execution] 4. **Recent US GDP trend?** — Annual 2025 real GDP growth appears ~2.2–2.5% (Q4 2025 SAAR +0.5%; Q3 2025 +4.4%; Q1 2026 +2.1%). FRED consensus (GDPC1CTM/GDPC1MD) shows 2026–2028 forecasts at 2.15%–2.30%. [FRED] 5. **Competing Kalshi 2030 buckets?** — Only B2.8 directly retrieved. Related: 2028 bucket B1.8 at 12%; 2029 bucket B4.8 at 3%. Distribution context suggests modal 2030 outcome is likely in 1.5%–2.5% range, making B2.8 a moderately above-modal outcome. [Kalshi related] # Key facts (high-confidence, factual) 1. [CBO Jan 2025] Long-run US real GDP growth projection: ~1.8%/yr through 2035. 2. [Fed SEP Jun 2026] Longer-run GDP growth median: ~1.8%. 3. [FRED GDPC1CTM/GDPC1MD] Professional forecasters' 2026–2028 consensus: 2.15%–2.30%. 4. [code_execution] Historical empirical rate for [2.6%,3.0%] band: 15% raw, ~8–9% model-based. 5. [FRED] Post-GFC (2010–2023) mean GDP growth: ~2.22%, std ~1.79%. 6. [Kalshi] B2.8 price was 8% as recently as ~7 days ago; now 17%. # Cross-market signals - **Kalshi related:** 2028 B1.8 at 12%; 2029 B4.8 at 3%. Suggests market prices lower growth buckets as more probable for nearby years. - **Polymarket:** No data retrieved. - **Sportsbook:** N/A. # Analyst opinions and speculation - OMB (Trump admin) projected 3.2% for 2026 — political outlier, not credible as 2030 forecast. [news] - All independent forecasters (CBO, Fed, IMF) cluster at 1.8%–2.1% long-run, making 2.6%–3.0% a tail outcome on the upside. - The sharp +9pp Kalshi move in 7 days with no obvious fundamental catalyst raises concerns about liquidity-driven noise rather than information. # Directional lean per outcome - **Yes (2.6%–3.0%):** Supported by: historical empirical frequency ~15%; band includes the historical mean (~2.7%); some scenarios of productivity boost (AI) or rebound from tariff shock could push growth up. Opposed by: all institutional forecasts anchor at ~1.8%; secular demographic/productivity headwinds; band is narrow (0.4pp) relative to volatility; recent trend data 2022–2026 shows growth below 2.6%. - **No:** Strongly supported by institutional forecasts (1.8% consensus), structural growth headwinds, and quantitative models (8–9% model-based probability for Yes). # Gaps / unknowns - No explicit 2030 IMF/CBO point estimate available; extrapolated from trend. - Cause of recent +9pp Kalshi price jump is unknown (thin market, single trader?). - AI productivity boom scenario not well-quantified; could shift distribution rightward. - Policy uncertainty (tariffs, fiscal) adds fat tails in both directions. # Calibration anchors - **Kalshi current YES price: 17%** (anchor, but note extreme recent volatility and thin history) - **Model-based base rate:** 8%–9% (normal distribution, post-GFC calibrated) - **Raw historical frequency:** ~15% (small sample, 40 years) - **Institutional forecast implied probability:** Very low (<10%) given consensus at 1.8% and band lower bound at 2.6% - **Reconciled estimate:** ~10%–12% — above pure model (8–9%) to account for empirical frequency and uncertainty over 4+ years, but well below current Kalshi price (17%) which appears driven by thin-market dynamics.

1. Both forecasters dismiss the Kalshi +9pp surge as thin-market noise without considering that the B2.8 bucket is embedded in a full distribution of competing buckets; if the modal bucket (likely 1.5%–2.5%) is priced elsewhere and B2.8 was previously at 8%, the 17% figure may actually imply meaningful redistribution across the full Kalshi 2030 GDP distribution that neither forecaster interrogates. 2. Neither forecaster adequately quantifies the AI productivity-boom tail scenario; the brief flags this as an unquantified upside risk, and given a 4-year horizon to 2030, a sustained productivity acceleration (as seen in the 1990s tech boom, which pushed growth into the 2.6%–3.0% band for multiple years) represents a plausible scenario that could non-trivially raise the probability above 12%. 3. Both forecasters treat the 2.6%–3.0% band as symmetric around its midpoint, but the brief notes the historical mean is ~2.7% — squarely inside the band — which means a rightward shift in the distribution (e.g., rebound from tariff shock, fiscal stimulus) would land probability mass directly in this bucket rather than above it, and neither rationale engages with this asymmetry. 4. The reconciliation to exactly 12% by both forecasters despite using different reasoning paths suggests anchoring on each other or on the brief's "reconciled estimate" of 10%–12%, rather than independently weighting the evidence; the identical outputs undermine confidence that either has genuinely stress-tested the 8%–9% model-based floor versus the 15% empirical ceiling. 5. Neither forecaster accounts for the possibility that professional forecasters' 2026–2028 consensus of 2.15%–2.30% could itself be systematically low if there is a cyclical upturn by 2029–2030, as GDP growth is mean-reverting and the brief shows Q3 2025 SAAR at +4.4% — a reminder that near-term volatility can produce years well above trend even when the long-run anchor is 1.8%. 6. The 2028 B1.8 bucket price of 12% is used loosely as context but neither forecaster notes the implied logical constraint: if B1.8 (the 1.6%–2.0% band, presumably) is priced at 12% for 2028, and B2.8 is 17% for 2030, this cross-year comparison suggests the market sees 2030 as slightly more likely to land in the higher bucket than 2028 in the lower one — a structurally odd relationship that warrants explanation rather than being passed over.

13% (medium confidence)

Yes: 13% No: 87%

Institutional forecasts (CBO, Fed, IMF) all cluster at 1.8-2.1%, well below this bucket's 2.6% lower bound, making Yes an upside-tail outcome. However, historical mean growth (~2.7%) sits inside the band, and the 4-year horizon plus AI-productivity/cyclical rebound scenarios warrant slightly more mass than pure model estimates (8-9%). The Kalshi 17% appears partly inflated by a thin-market surge, so I settle at 13%, between the model floor and empirical frequency (~15%).

Total pipeline time: 128.9s