CPI vs PPI Divergence Signal

Signal Summary:

• Configuration statement (mandatory): Given a PPI YoY of 13.07%, a CPI YoY of 4.16%, and a divergence z-score of 1.64, this setup aligns with Upward-biased price paths and Elevated volatility, where the dominant risk is Trend continuation, not Mean reversion.
• The signal is currently in a HOT (inflation pressure) regime, indicating significant upstream price growth exceeding consumer rates (1).
• Conviction Band: High; Interpretation Confidence: High Confidence; Internal Conflict Flag: No. Signal Stability Assessment: Improving; Threshold Proximity: Far; Revision Sensitivity: High.

Methodology Applied:

• A z-score ≥ 1.0 defines a HOT regime, signaling significant upstream price pressure (1).
• Positive divergence (PPI > CPI) explicitly indicates inflationary/expansionary pressure within the production chain (1).
• Pass-through from producer to consumer prices is defined as lagged and non-linear (1).
• CPI vs PPI Divergence Signal, latest observation: 2026-05-31 (1).

Key Dynamics:

• The primary driver is the sharp acceleration in PPI YoY to 13.07%, pushing the z-score to 1.64 (1).
• The signal shows strengthening momentum, with the PPI-CPI gap widening from 3.46 to 8.91 points over three months (1).
• No internal tensions are present as both z-score and absolute CPI (4.16%) confirm the HOT classification (1).
• Conditional Invalidation: A z-score retreat below 1.0 while CPI remains elevated (1).
• The signal has shown high persistence, remaining in the HOT regime for two consecutive months with increasing magnitude.

Scenario Balance:

• Dominant base case: Continued inflationary pressure as upstream costs are passed to consumers.
• Most plausible upside risk: Acceleration in CPI YoY as retailers exhaust margin absorption capacity.
• Most plausible downside risk: Sudden commodity price collapse reversing PPI lead.

Time Horizon & Aggregation:

• Time Horizon: Cyclical (months) because production chain imbalances typically take quarters to normalize.
• Aggregation Weight Hint: High, given the extreme z-score deviation and rising underlying CPI.

Macro Relevance:

• Informs the pricing and inflation dimension by identifying pipeline cost shocks.
• The economic mechanism implies margin compression for downstream firms or a secondary wave of consumer inflation (1).
• Cycle position: Not determined by this methodology.
• Typically interacts with inflation breakevens and unit labor costs to confirm broad-based regime shifts.

Regime Context:

• The regime is newly entered (April 2026) and persistent, currently in its second month of duration.
• The direction of change is strengthening, with the divergence z-score rising from 1.07 to 1.64 (1).

Model Limitations:

• PPI is subject to multi-month revisions which may shift historical z-score calculations (1).
• Seasonal factor updates can alter the perceived strength of the divergence trend (1).

Data & References:

• CPI vs PPI Divergence Signal (2026-05-31) (1).
• Divergence z-score (1.64) and PPI YoY (13.07%) are the most influential data points.
• ISM Prices Paid and Unit Labor Costs would improve reliability of the pass-through assessment.