base rate:
Nominal US federal spending has decreased year-over-year only a handful of times in modern history: post-WWII demobilization, and FY2022 vs FY2021 (post-COVID drawdown from ~$6.8T to ~$6.3T). Outside these exceptional circumstances, spending essentially always grows. A $250B reduction from Q4 2024 to Q4 2026 would represent ~3.5-4% nominal decline — the base rate for this occurring in a non-post-crisis period is effectively 0-2%.
evidence updates:
All major evidence pushes DOWN from even the low base rate: (1) FY2025 outlays are $275B HIGHER than FY2024 — we're moving in the wrong direction. (2) Mandatory spending growth (Social Security COLA, Medicare, net interest >$1T) creates massive structural headwinds. (3) DOGE claimed savings have not appeared in actual Treasury data. (4) No significant budget legislation has passed or appears imminent. (5) The Education Department accounting change is a reclassification, not real savings. The only factor pushing slightly UP is the unprecedented nature of DOGE/Trump executive action, but even this has produced no measurable aggregate outlay reduction.
combination method:
Weighted average of three sub-questions with weights 0.35, 0.40, 0.25. Sub-questions are highly correlated (all depend on total outlays declining). The combined estimate of ~4% reflects the near-impossibility of achieving a $250B reduction given that spending has increased substantially and structural drivers continue pushing upward.
final:
The probability of government spending decreasing by at least $250B from Q4 2024 to Q4 2026 is approximately 4%. Every piece of available evidence points strongly against this outcome: spending is rising, mandatory programs are growing rapidly, DOGE savings haven't materialized in aggregate data, and no legislative pathway exists for cuts of this magnitude. The only residual probability accounts for extreme tail scenarios like massive accounting reclassifications being treated as real spending reductions, or an unprecedented legislative/executive action in the remaining months.
ensemble:
{'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.04, 'confidence': 0.92}, 'evidence_driven': {'p_yes': 0.04, 'confidence': 0.92}, 'contrarian': {'p_yes': 0.04, 'confidence': 0.92}}, 'spread': 0.0, 'individual_p_yes': {'base_rate': 0.04, 'evidence_driven': 0.04, 'contrarian': 0.04}}