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Will the ECB cut the deposit rate by at least 25bp by October 23, 2026?

activeMonetary DivergenceResolves: October 23, 2026

The Condition

Fed cuts rates by at least 50bp total by September 2026 FOMC (to ≤3.25%)

External probability: 42.0%Source: CME FedWatch / PolymarketResolves: September 17, 2026

Our Ensemble Estimates

If condition is true
62%
Model agreement: 68%

Given Fed cuts ≥50bp by Sep: Will the ECB cut the deposit rate by at least 25bp by October 23, 2026?

If condition is false
33%
Model agreement: 76%

Given Fed disappoints on cuts: Will the ECB cut the deposit rate by at least 25bp by October 23, 2026?

Causal Effect

+29pp(positive)

Fed rate cuts worth ~29pp to ECB resuming easing — driven by EUR appreciation forcing HICP below target, activating ECB institutional mandate for symmetric inflation targeting

Unconditional probability:45.2%(blended: P(Y|T) × 42.0% + P(Y|F) × 58.0%)

Why This Matters

Tests the self-limiting divergence feedback loop: Fed cuts strengthen the EUR, which compresses eurozone inflation below target (HICP projected at 1.9%, already at 1.7% in recent readings), potentially forcing the ECB into a defensive rate cut. The ECB has been on hold since mid-2025 at 2.00% after 8 prior cuts. If the Fed delivers ≥50bp, further EUR appreciation would amplify the disinflationary impulse on the eurozone economy, increasing pressure on the ECB to resume easing. This creates the paradoxical temporary gap re-widening scenario (15% probability per monetary-divergence lens) before eventual convergence.

Resolution Criteria

ECB announces a reduction of the deposit facility rate from its current level of 2.00% by at least 25bp at any Governing Council meeting through October 23, 2026

Source: ECB Monetary Policy Decisions (https://www.ecb.europa.eu/press/govcdec/mopo/html/index.en.html)Date: October 23, 2026

Source Analysis

February HICP flash estimate below 1.8% would strengthen the case for ECB resuming cuts, creating paradoxical temporary gap re-widening

Monetary DivergenceDIVERGENCE_TRAJECTORYPriority: HIGH