Highly diverse responses of monetary and fiscal policies have been observed around the world in the post global financial crisis period of 2010-2014. While some countries implemented various mixes of monetary and/or fiscal stimuli, others have seen austerity. Our paper explores whether the strategic interaction between the central bank and government can shed some light on this diversity, and what lessons about the institutional design of the two policies can be learnt from it. This is done by mapping a reduced-form New Keynesian model into a generalised game-theoretic framework with deterministic and stochastic revisions of policy actions. Our focus is on the short-term policy interaction regarding stabilisation of an adverse shock (rather than long-term issues related to fiscal sustainability and unpleasant monetarist arithmetic). Particular attention is paid to the effect of institutional and structural features such as inflation targeting, monetary and fiscal implementation lags, and the policies' leadership.
I IntroductionThe aftermath of the global financial crisis has seen a variety of monetary and fiscal policy mixes across the globe. Ranging from fiscal stimulus to austerity measures to quantitative easing, policy-makers in governments and central banks have used a number of different economic recipes. In an attempt to understand this plurality and provide novel insights and policy recommendations, this paper examines monetary-fiscal interactions following a major adverse shock.Our focus is on the strategic aspect of the monetary/fiscal responses to the shock. This is because the literature is scarce on this point, with most papers assuming that the two policies are able and willing to perfectly coordinate their actions. The 2010-2014 period has, however, shown us that this is not necessarily the case. For example, while central banks have attempted to lower long-term yields via quantitative easing, governments have tended to issue long-term rather than short-term bonds, and thus sabotage the central banks' stimulatory efforts. 1