DNB Analysis Finds Financial and Geopolitical Uncertainty Weakens Monetary Policy Transmission

Key Takeaways

• De Nederlandsche Bank published an analysis showing that interest rate changes have a smaller and less apparent effect on growth and inflation when uncertainty is high, particularly financial and geopolitical uncertainty.
• The publication is not a rule and imposes no obligations, but it matters for compliance and risk teams because it challenges assumptions about how quickly and fully rate moves flow through to the economy, and it bears on stress testing, scenario design, and interest rate risk management.

Deep Dive

De Nederlandsche Bank published an analysis showing that interest rate changes have a smaller and less apparent effect on growth and inflation when uncertainty is high, particularly financial and geopolitical uncertainty. The publication is not a rule and imposes no obligations, but it matters for compliance and risk teams because it challenges assumptions about how quickly and fully rate moves flow through to the economy, and it bears on stress testing, scenario design, and interest rate risk management.

The analysis examines three uncertainty measures (financial, macroeconomic, and geopolitical) and estimates the impact of a 25 basis point rate rise under high and low uncertainty. When uncertainty is low, a rise produces a more pronounced slowdown in growth and a larger fall in inflation. When uncertainty is high, particularly financial or geopolitical, these effects are smaller and less apparent. The results are symmetrical for rate cuts. DNB stresses that monetary policy is not ineffective in uncertain times, but its effects may be delayed or muted.

For compliance and risk teams, the main relevance is indirect. The findings suggest that the pass-through of European Central Bank (ECB) rate decisions to credit demand, asset quality, and inflation may be less predictable during periods of stress. Institutions that rely on static or linear assumptions in interest rate risk in the banking book (IRRBB), ICAAP/ILAAP, stress testing, and business planning may be underestimating the range of outcomes. DNB also notes that central banks may need to respond more forcefully to achieve their inflation objectives. This raises the possibility of larger or more prolonged rate moves, with implications for funding costs, net interest income sensitivity, and borrower repayment capacity.

Because the three uncertainty measures do not always coincide, a single indicator is insufficient for risk assessment. This aligns with DNB's own message that central banks should use a broad set of indicators and a flexible, data-driven approach. Firms should consider whether their scenario frameworks and early-warning indicators capture financial, macroeconomic, and geopolitical uncertainty separately. The emphasis on clear communication may also foreshadow supervisory expectations for transparent explanations of the assumptions behind models and risk decisions.

Recommended actions:
- Brief risk committees and the treasury, ALM, and credit risk functions on the findings.
- Review rate-shock and macroeconomic scenarios for state-dependent transmission, such as dampened pass-through when uncertainty is high.
- Add uncertainty indicators, including geopolitical and financial market stress measures, to monitoring dashboards.
- Reassess model assumptions and documentation for IRRBB, expected credit loss (ECL) forward-looking overlays, and customer behavior.
- Monitor DNB and ECB communications for any supervisory follow-up.

Overall impact is low for immediate compliance but moderate for strategic risk management. There is no implementation timeline, though the findings are relevant to upcoming planning, stress testing, and model validation cycles.

Source: De Nederlandsche Bank