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pred-2026-03-27-128

The OBR will maintain its 2026 UK GDP growth forecast at or above 1.5% in the Spring Statement 2026, with only marginal downward revision from the ~2.0% Autumn 2025 baseline, as energy price stabilization, Bank of England rate cuts, and moderating inflation offset geopolitical risks and trade headwinds.

resolved · correct tier 1 economic political institutional energy
confidence 0.370
created
2026-03-27
resolves
2026-04-01
resolved
2026-04-06
outcome
0
brier
0.1369
base rate
0.44
meta-confidence
medium
Evidence for (8)
  • Energy markets are forward-looking; Hormuz risks priced in by Q4 2025 reduce shock impact on Spring forecast
  • BoE rate-cutting cycle (likely ongoing by March 2026) would provide material downside offset to energy/trade shocks
  • Q4 2025 / Q1 2026 ONS data on consumer spending, employment, and business investment could show resilience that supports maintaining central growth view
  • Brexit adjustment phase largely complete; businesses adapted supply chains and trade patterns; incremental trade deterioration less severe than 2021-2023
  • OBR methodological conservatism: moves to 1.5% threshold unusual absent severe new shock; 2.0% Autumn baseline may already embed downside risks
  • Global growth holding near consensus (not collapsing): supports UK export base and FDI inflows, limiting downside
  • Inflation moderation enables policy easing and consumer confidence recovery, partially offsetting trade headwinds
  • Historical OBR practice: Spring statements typically feature smaller revisions than Autumn reviews; large 50+ bps downgrades between Autumn and Spring rare unless exogenous shock emerges
Evidence against (7)
  • Hormuz strait tensions could escalate March 2026, pushing Brent crude above $85/bbl with material stagflationary impact on near-term growth
  • UK-EU trade friction deepening: additional tariffs, NTBs, or supply-chain disruptions between now and Spring manifest in revised forecasts
  • Sticky inflation (headline 3%+) constrains BoE rate cuts; real interest rates remain elevated, dampening investment and housing
  • Q4 2025 growth data weak (PMI contraction, retail weakness, business investment declining), forcing downward revision momentum into Spring
  • OBR precedent for aggressive downward revisions: December 2022 (0.4%), March 2022 (-4.5% for 2022); Hormuz shock could trigger similar institutional response
  • Financial conditions tightening (credit spreads, yield curve inversion, portfolio reallocation): reduces growth transmission even if energy stabilizes
  • US growth slowdown / recession fears ripple to UK via trade and confidence channels

Reasoning chain

The original prediction claims a specific, material downward revision to <1.5%, requiring energy costs and trade to meaningfully worsen the economic outlook. This counter-argues that (1) oil markets will have priced Hormuz risks by March 2026, reducing shock impact; (2) BoE easing will provide offsetting support; (3) new ONS data may show resilience that justifies maintaining or only modestly reducing the 2.0% baseline; (4) OBR revisions of this magnitude (200+ bps) between Autumn and Spring are historically uncommon absent truly severe shocks; (5) Brexit impacts, while real, are now largely anticipated and embedded in supply-chain adjustments. The argument is NOT that growth will accelerate, but that downside will be contained to the 1.5–2.0% band rather than breaking through the 1.5% floor. Confidence remains below 50% because geopolitical risk and energy transmission channels are real, but the specific threshold and timing of the original claim create testable vulnerability.

Falsification criteria

The OBR Spring Statement 2026 (released by 2026-03-31) official forecast for 2026 UK GDP growth falls below 1.5%, confirming the original prediction.

Brier breakdown

Calibration − resolution + uncertainty = Brier score. Lower calibration is better; higher resolution is better.

Post-mortem

Auto-resolved (falsified, confidence=0.97). Evidence: The OBR Spring Statement 2026 (delivered March 26, 2026) officially forecast UK GDP growth for 2026 at 1.1%, down from the November 2025 forecast of 1.4%. This is well below the 1.5% threshold specified in the falsification criteria. The downgrade was driven by weaker-than-expected GDP data at end-2025, subdued business sentiment, and rising unemployment. The prediction also incorrectly assumed the Autumn 2025 baseline was ~2.0%; it was actually ~1.4%, meaning the prediction was starting from an already-weak baseline. Sources: https://commonslibrary.parliament.uk/research-briefings/cbp-10495/; https://www.gbnews.com/money/spring-statement-economy-gdp-downgrade-obr-reeves; https://caseron.co.uk/spring-forecast-2026-obr-economic-fiscal-outlook/. Reasoning: The falsification criteria states the prediction is falsified if the OBR Spring Statement 2026 official forecast for 2026 UK GDP growth falls below 1.5%. The OBR released its Spring Forecast on March 26, 2026, showing a 2026 GDP growth forecast of 1.1% — a 0.3pp downgrade from the November 2025 forecast of 1.4%, and well below the 1.5% threshold. The prediction claimed energy price stabilization and BoE rate cuts would preserve growth at or above 1.5%; in fact, weaker output data and business activity more than offset these factors. The prediction is clearly falsified.