Non-Ricardian behavior shapes monetary-fiscal outcomes

The Riksbank staff memo systematically examines how monetary-fiscal interactions are altered when Ricardian equivalence fails due to three distinct factors.

When a portion of households is liquidity-constrained, termed 'hand-to-mouth', or when policy operates under 'fiscal dominance', a consistent pattern emerges.

In these scenarios, a supply shock typically results in a more pronounced inflation response and a weaker output response compared to a standard Ricardian model.

Conversely, demand shocks tend to induce larger fluctuations in real economic activity.

The study also highlights varying impacts on real government debt, which becomes more volatile with hand-to-mouth households but less so under fiscal dominance.

Distortionary taxation provides an additional channel for Ricardian equivalence failure.

Under monetary dominance, an increase in consumption tax generally reduces core inflation and is more contractionary for output.

In contrast, an increase in labour-income tax tends to intensify inflationary pressures, though its output contraction is less severe.

This unified framework allows for a clear comparison of these non-Ricardian behaviors and their implications for macroeconomic stability.

The paper's relevance stems from the post-pandemic inflation surge between 2021 and 2023, a global phenomenon driven by a complex interplay of supply and demand shocks.

While initial intuition pointed to factors like labor shortages and disrupted logistics, monetary and fiscal policies also amplified these pressures.

Central banks initially underestimated inflation's persistence, while fiscal policies remained highly expansionary, leading to persistent large budget deficits.

This context raises critical questions about the future conduct of both monetary and fiscal policy, particularly regarding inflation's trajectory and the sustainability of public debt.

The study addresses a long-standing debate among economists, moving beyond the simplifying assumption of Ricardian equivalence, which often downplays monetary-fiscal interactions in standard models.

By relaxing this assumption, the memo provides a more nuanced understanding of how these policies interact, especially in an environment of high public debt and evolving economic pressures.