In the low inflation and low interest rate environment that prevailed over the period 2013-2020, many argued that besides expansionary monetary policy, expansionary fiscal policy could also support central banks’ efforts to bring inflation closer to target. During the pandemic, proper alignment of fiscal and monetary policy was again crucial in promoting a rapid macroeconomic recovery. Since the end of 2021 an environment of higher inflation, lower growth, higher uncertainty, and higher interest rates has changed the nature of the required policy mix and poses different challenges to the interaction between monetary and fiscal policy. Following up on the work done under the ECB’s 2020 strategy review (see Debrun et al., 2021), this report explores some of the renewed challenges to monetary and fiscal policy interactions in an environment of high inflation. The main general conclusion is that, with an independent monetary policy that aims to bring inflation back to target in a timely manner, it is still possible to design fiscal policy in a way that protects vulnerable parts of society against the costs of high inflation without pulling against the central bank’s effort to tame inflation. This is more likely to be the case if fiscal measures are temporary and targeted, and if priority is given to structural reforms and public investment in support of potential growth. The latter is particularly effective in reshaping the supply side of the economy in a manner that is likely to have a lasting positive structural impact.

This paper studies fiscal policy in a New Keynesian DSGE model with endogenous technology growth in which scarring can occur endogenously through hysteresis effects in TFP. Both demand- and supply-driven recessions can weaken investment in R&D and technology adoption, thus depressing the long-run trend. Fiscal policy has long-term effects under endogenous growth and the type of fiscal stimulus is decisive for the sign and magnitude of fiscal multipliers. Expansionary government spending boosts output transitorily but over time crowding out in technology-enhancing investment weakens the long-run trend. I introduce fiscal growth policies in this environment which in the short run raise aggregate demand and simultaneously support growth-enhancing investment and thus the long-run trend, generating a positive trend multiplier. Multipliers of fiscal growth policies can be sizeable, above all when targeted to R&D, which is characterized by fiscal multipliers greater than unity. The importance of monetary-fiscal interaction is amplified due to long-run non-neutrality of monetary policy.

This paper studies monetary-fiscal interactions when the real rate exceeds trend growth (r > g) in a New Keynesian model with endogenous growth through R&D. Unfunded fiscal expansions stimulate demand, innovation and growth, creating fiscal capacity that attenuates fiscal inflation. The Taylor principle is insufficient for determinacy if fiscal policy adjusts surpluses to stabilize debt. Instead, a dynamic r - g stability criterion characterizes feasible monetary-fiscal frameworks. If surpluses do not adjust to stabilize debt, monetary policy should lower r - g with inflation, and adherence to the Taylor principle can be consistent with a unique bounded equilibrium.

We study the performance of monetary policy strategies under endogenous long - run growth. We show that under endogenous growth the gains from make - up strategies over inflation targeting are amplified as they can alleviate hysteresis effects in total factor productivity (TFP) and related permanent scars to the long - run trend. This result is strengthened under low r* as tight monetary policy space raises the frequency of zero lower bound (ZLB) episodes in which long - run trend effects are particularly adverse. Under endogenous growth, make - up strategies are subject to additional implementation challenges related to communication, measurement, and credibility. Finally, we argue that under endogenous growth inflationary supply shocks generate a trade - off between inflation stabilization and the stabilization of output over both the short and the long run which can be mitigated by confining make - up elements to ZLB episodes.

This paper provides an assessment of the macroeconomic models regularly used for forecasting and policy analysis in the Eurosystem. These include semi-structural, structural and time-series models covering specific jurisdictions and the euro area within a closed economy, small open economy, multi-country or global setting. Models are used as analytical frameworks for building baseline projections and for supporting the preparation of monetary policy decisions. The paper delivers four main contributions. First, it provides a survey of the macroeconomic modelling portfolios currently used or under development within the Eurosystem. Second, it explores the analytical gaps in the Eurosystem models and investigates the scope for further enhancement of the main projection and policy models, and the creation of new models. Third, it reviews current practices in model-based analysis for monetary policy preparation and forecasting and provides recommendations and suggestions for improvement. Finally, it reviews existing cooperation modalities on model development and proposes alternative sourcing and organisational strategies to remedy any knowledge or analytical gaps identified.

This paper analyses the role of endogenous total factor productivity dynamics in explaining business cycle persistence as well as the missing (dis-)inflation and productivity puzzles in the euro area. We show by means of an estimated medium-scale DSGE model in which TFP evolves endogenously as the result of costly investment in R&D and technology adoption that the endogenous slowdown in total factor productivity can explain the depth and persistence of the output drop and the weak recovery following the double-dip recession in the euro area. Our results suggest that a decrease in R&D efficiency and innovation is key in explaining the pre-crisis euro area productivity slowdown, while as of 2008 a crises-induced drop in technology adoption constitutes the most important factor. We document a flattening of the Phillips curve relationship under the endogenous TFP mechanism, resulting from the interaction between inflation and productivity dynamics. The endogenous reaction in TFP dampens the inflation response over the business cycle and can thus help explain both the moderate fall in euro area inflation during its crises and its sluggish increase in the subsequent recovery.

This paper analyses the endogeneity of euro area total factor productivity and its role in business cycle amplification by estimating a medium-scale DSGE model with endogenous productivity mechanism on euro area data. In this framework, total factor productivity evolves endogenously as a consequence of costly investment in R&D and adoption of new technologies. We find that the endogeneity of TFP induces a high degree of persistence in the euro area business cycle via a feedback mechanism between overall economic conditions and investment in productivity-enhancing technologies. As to the sources of the euro area productivity slowdown, we conclude that a decrease in the efficiency of R&D investment is among the key factors generating the pre-crisis productivity slowdown, while starting from the Great Recession a shock to liquidity demand is identified as the most important driving force. The endogenous technology mechanism further exerts a dampening effect on the inflation response following a recessionary shock and hence has important implications for both the negligible fall in inflation during the Great Recession, as well as the sluggish increase of inflation in the subsequent recovery.

I propose a two-sector endogenous growth model with heterogeneous sectoral productivity and sector-specific, nonlinear hiring costs to analyse the link between sectoral resource allocation, low productivity growth and stagnant real wages. My results suggest that an upward shift in the labor supply, triggered for instance by a labor market reform, as among others implemented in Germany in 2003-2005, is beneficial in the long-run as it raises growth of technology, labor productivity and real wages. I show, however, that in the immediate phase following the labor supply shock, labor productivity and real wages stagnate as employment gains are initially disproportionally allocated to low-productivity sectors, limiting the capacity for technology growth and depressing real wages and productivity. I demonstrate that due to the learning-by-doing growth externality in the high-productivity sector the competitive equilibrium is ineffcient as firms fail to internalize the effect of their labor allocation on aggregate growth. Subsidies to high-productivity sector production can alleviate welfare losses along the transition path.

Published in European Central Bank Working Paper Series 2401/2020 https://www.ecb.europa.eu/pub/research/working-papers/html/index.en.html