Beyond Ricardian Equivalence: rethinking monetary-fiscal coordination
In this paper Lukasz Rachel and Morten O. Ravn re-examine the fundamental principles of monetary-fiscal policy coordination when Ricardian Equivalence fails. The authors build a perpetual youth (OLG) New Keynesian model in which households have finite planning horizons, causing Ricardian Equivalence to fail . The core mechanism is that government bonds are perceived as net wealth by households, because currently alive cohorts know they may not be around to pay future taxes, creating a two-way interdependence between government debt and inflation dynamics (unlike RANK, where the dependence runs only one way).
Findings
- The old “active vs. passive” policy labels no longer apply. In the standard textbook framework, either the central bank or the fiscal authority had to be clearly “in charge” i.e. one active, one passive, for the economy to have a stable, predictable equilibrium. Rachel and Ravn show that once households treat government debt as real wealth, this clean division disappears entirely. Monetary and fiscal policy are always interacting with each other, and there is no threshold that separates one regime from the other .
- The Taylor Principle is no longer the master rule. The standard prescription that central banks must raise interest rates by more than one-for-one with inflation (the Taylor Principle) is neither a guarantee of stability nor a strict requirement for it. On the one hand, the wealth effects of government debt already provide a stabilizing force that can substitute for aggressive monetary tightening. On the other hand, if the central bank raises rates too aggressively while the fiscal authority is slow to respond, it can actually destabilize the economy because higher interest rates raise the cost of servicing government debt, which stimulates household spending and pushes inflation further up .
- Sunspot-driven boom-bust cycles are less likely but outright instability is more likely. Compared to the standard model, the non-Ricardian setting is actually better at ruling out self-fulfilling bubbles and expectations-driven crises. However, the flip side is that certain combinations of monetary and fiscal policy that would have been perfectly stable in the old framework can lead to explosive, ever-widening swings in output and inflation when households treat debt as wealth .
- Deficits are always inflationary, not only in extreme regimes. In the standard RANK model, government deficits only cause inflation in the special “fiscal dominance” scenario. In this paper’s framework, whenever a stable equilibrium exists, a surprise deficit always pushes up both output and inflation. Fiscal policy has a direct demand-side effect that monetary policy cannot simply offset by adjusting interest rates .
- The economy responds smoothly to policy changes, not in sudden jumps. In the non-Ricardian model, the economy’s behavior shifts gradually and continuously as policy parameters change, which makes the framework more realistic and more suitable for practical policy analysis .
Brothers in Arms: Monetary-Fiscal Interactions Without Ricardian Equivalence
Authors: Lukasz Rachel, Morten O. Ravn
From: University College London
Why fiscal inaction helps central banks
This paper by George-Marios Angeletos, Chen Lian, and Christian K. Wolf share the core insight with Rachel and Ravn above that non-Ricardian households fundamentally alter the fiscal-monetary nexus, namely that government debt stimulates demand directly, and fiscal policy can never truly “step aside.” Where Rachel-Ravn ask whether a stable equilibrium exists under different policy rules, Angeletos et al. take determinacy as given and ask which fiscal stance best supports the central bank’s mandate. Together, they form a complementary pair: Rachel-Ravn map the feasibility frontier of monetary-fiscal coordination, while Angeletos et al. identify the optimal point within that frontier.
Angeletos et al. also use a perpetual-youth OLG New Keynesian model, the same framework as Rachel and Ravn, but introduce an innovation in the form of a simple “dial” that goes from “immediate adjustment” (taxes rise right away to cover any deficit) to “no adjustment at all” (taxes never respond to debt). The central bank, meanwhile, is assumed to set interest rates optimally to minimize fluctuations in output, inflation, and interest rates.
Findings
- Slow fiscal adjustment is a surprisingly powerful stabilizer. When the economy enters a recession, tax revenues fall automatically. If the government then raises taxes quickly to plug the gap, it takes money out of households’ pockets at exactly the wrong moment, deepening the downturn. If instead tax hikes are delayed, or avoided altogether, households feel less squeezed, spend more, and the recession is moderated. The authors show this mechanism is so powerful that, in principle, sufficiently slow fiscal adjustment can neutralize the cumulative impact of any shock on the economy .
- The central bank actually wants the government to do nothing. The conventional wisdom is that the fiscal authority should adjust taxes quickly so the central bank has a clean hand in controlling output and inflation. The authors show the opposite: a non-adjusting fiscal stance does much of the stabilization work for the central bank, allowing it to move interest rates less aggressively and achieve a better trade-off between its goals .
- This result depends on the type of shock hitting the economy. When recessions are caused by a collapse in demand slow fiscal adjustment is unambiguously helpful. When recessions are caused by supply-side disruptions the picture is more nuanced, but slow fiscal adjustment can still be beneficial if tax hikes themselves contribute to inflation by raising firms’ costs .
- US data confirms the theory. In their quantitative exercise, the authors find that the Federal Reserve’s objectives are best served by near-zero fiscal adjustment. Two empirical facts drive this result: US households have high marginal propensities to consume (so delayed tax hikes have a large stimulative effect), and US business cycles are predominantly driven by demand disturbances rather than supply shocks .
Fiscal inaction as monetary support
Authors: George-Marios Angeletos, Chen Lian, Christian K. Wolf
From: Northwestern University, UC Berkeley, MIT
