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Trade Fragmentation, Inflationary Pressures and Monetary Policy Summary

The paper analyzes the macroeconomic effects of trade fragmentation, examining its impact on inflationary pressures and optimal monetary policy responses in a small open economy. Using a two-sector New Keynesian model with heterogeneous households (constrained and unconstrained) and imperfect international risk sharing, the study finds that trade fragmentation does not necessarily lead to inflationary pressures. Instead, the overall effect on inflation depends critically on how aggregate demand adjusts to lower real incomes.

Three fragmentation scenarios are explored:

1. Gradual increase in import prices: Leads to persistent import inflation but is counteracted by domestic inflationary pressures falling due to reduced consumption and labor supply adjustments. In this case, demand adjustments dominate, leading to disinflationary pressures.
2. Front-loaded import price shock: Results in a temporary increase in inflation (stagflation) due to supply constraints and demand-side adjustments. This creates a trade-off for policymakers, requiring tightening monetary policy to return inflation to target.
3. Persistent decline in tradable sector productivity: Shifts the balance toward deflationary effects due to higher marginal costs and reduced consumption, partially offset by wage and labor supply adjustments.

Key determinants include:

• Household heterogeneity: A higher share of constrained households reduces the anticipatory adjustment in consumption, weakening demand-side effects.
• Degree of openness: More open economies are more exposed to foreign price shocks but can diversify, mitigating domestic shock impacts.
• Wage rigidities: Nominal wage stickiness introduces additional supply-side constraints, amplifying output and inflation responses.

In all scenarios, the form of fragmentation matters. Gradual changes allow for anticipatory demand adjustments, avoiding inflationary spikes, while front-loaded or supply-side shocks create temporary trade-offs. Conversely, persistent productivity shocks may be neutral or deflationary.

These findings highlight that central banks must consider intertemporal demand adjustments and structural factors (e.g., household heterogeneity, openness) when designing monetary policy responses. Trade fragmentation poses complex policy trade-offs, and "look-through" policies may not always apply.