CPI vs PPI Divergence Signal

Signal Summary:

• Configuration statement (mandatory): Given a divergence z-score of 1.13 and CPI YoY of 3.78%, this setup aligns with Upward-biased price paths and Elevated volatility, where the dominant risk is Regime shift, not mean reversion.
• The signal has transitioned to a "HOT" inflationary regime, marking an end to a 30-month neutral/disinflationary stretch (1).
• Conviction Band: High; Interpretation Confidence: High Confidence; Internal Conflict Flag: No. Signal Stability Assessment: Deteriorating; Threshold Proximity: Near; Revision Sensitivity: High.

Methodology Applied:

• z-score >= 1.0 identifies significant upstream price pressure exceeding consumer growth (1).
• Positive divergence (PPI > CPI) indicates inflationary and expansionary pressure (1).
• PPIACO and CPIAUCSL are the primary drivers of the divergence z-score (1).
• Dataset: CPI vs PPI Divergence; latest observation April 30, 2026.

Key Dynamics:

• The dominant driver is the surge in PPI YoY to 9.82%, which significantly outpaces the 3.78% CPI rate (1).
• Momentum has accelerated sharply, with the 3-month divergence change reaching 6.03 in April (1).
• Internal coherence is high as both indices are rising, though upstream velocity is triple the downstream rate.
• Conditional Invalidation: An absolute z-score retrenchment below 0.35 (1).
• History shows a sudden break from a stable neutral regime that persisted since late 2023 (1).

Scenario Balance:

• Base Case dominant: Continued pipeline inflation pass-through to consumers.
• Upside risk: Accelerated margin compression if retailers cannot pass on 9%+ producer costs.
• Downside risk: Sharp PPI revision downward during the next release window (1).

Time Horizon & Aggregation:

• Time Horizon: Cyclical (months) as producer costs typically lead consumer price adjustments.
• Aggregation Weight Hint: High; the breach of the 1.0 z-score threshold is a primary macro warning.

Macro Relevance:

• Informs pricing power and corporate margin dimensions (1).
• Economic mechanism: Pipeline inflation pressure leading to potential margin compression for retailers (1).
• Cycle position: Not determined.
• Interacts with Inflation Breakevens and ISM Prices Paid for confirmation (1).

Regime Context:

• Newly entered HOT regime after 30 months of neutrality or cooling.
• Direction of change: Strengthening inflationary pressure.

Model Limitations:

• PPI is subject to multi-month revisions and seasonal factor updates (1).
• Pass-through to CPI is recognized as lagged and non-linear (1).

Data & References:

• Latest Data: April 30, 2026 (Fresh).
• Influential Datapoints: PPI YoY (9.819) and Divergence z-score (1.126) (1).
• Related Data: ISM Prices Paid and Unit Labor Costs (1).