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The Global Integrated Monetary and Fiscal Model (GIMF) – Theoretical Structure
This working paper presents a comprehensive overview of the theoretical structure of the Global Integrated Monetary and Fiscal Model (GIMF), a multi-region dynamic general equilibrium model that is used by the IMF for a variety of tasks including policy analysis, risk analysis, and surveillance.
Getting to Know GIMF
The Global Integrated Monetary and Fiscal model (GIMF) is a multi-region, forward-looking, DSGE model developed by the Economic Modeling Division of the IMF for policy analysis and international economic research. Using a 5-region version of the GIMF, this paper illustrates the model’s macroeconomic properties by presenting its responses under a wide range of experiments, including fiscal, monetary, financial, demand, supply, and international shocks.
Effects of Fiscal Stimulus in Structural Models
The paper assesses, using seven structural models used heavily by policymaking institutions, the effectiveness of temporary fiscal stimulus. Models can, more easily than empirical studies, account for differences between fiscal instruments, for differences between structural characteristics of the economy, and for monetary-fiscal policy interactions. Findings are: (i) There is substantial agreement across models on the sizes of fiscal multipliers. (ii) The sizes of spending and targeted transfers multipliers are large. (iii) Fiscal policy is most effective if it has some persistence and if monetary policy accommodates it. (iv) The perception of permanent fiscal stimulus leads to significantly lower initial multipliers.
The Benefits of International Policy Coordination Revisited
This paper uses two of the IMF’s DSGE models to simulate the benefits of international fiscal and macroprudential policy coordination. The key argument is that these two policies are similar in that, unlike monetary policy, they have long-run effects on the level of GDP that need to be traded off with short-run effects on the volatility of GDP. Furthermore, the short-run effects are potentially much larger than those of conventional monetary policy, especially in the presence of nonlinearities such as the zero interest rate floor, minimum capital adequacy regulations, and lending risk that depends in a convex fashion on loan-to-value ratios. As a consequence we find that coordinated fiscal and/or macroprudential policy measures can have much larger stimulus and spillover effects than what has traditionally been found in the literature on conventional monetary policy.
Fiscal Stimulus to the Rescue? Short-Run Benefits and Potential Long-Run Costs of Fiscal Deficits
This paper uses the IMF's Global Integrated Monetary and Fiscal Model to compute shortrun multipliers of fiscal stimulus measures and long-run crowding-out effects of higher debt. Multipliers of two-year stimulus range from 0.2 to 2.2 depending on the fiscal instrument, the extent of monetary accommodation and the presence of a financial accelerator mechanism. A permanent 0.5 percentage point increase in the U.S. deficit to GDP ratio raises the U.S. tax burden and world real interest rates in the long run, thereby reducing U.S. and rest of the world output by 0.3-0.6 and 0.2 percent, respectively.
Wage Moderation in Crises
The paper studies the impacts of wage moderation in the euro area. Simulation results show that if a single euro area crisis-hit economy undertakes wage moderation, the impact on output is positive for that economy and for the entire euro area. If all crisis-hit economies undertake wage moderation together, their output still expands, albeit to a lesser degree. If the wage moderation is accompanied by cuts in policy interest rates by the central bank—and by quantitative easing once interest rates hit the zero lower bound—then output for the entire euro area expands as well.
Budget Consolidation
The paper evaluates the costs and benefits of fiscal consolidation using simulations based on the IMFs global DSGE model GIMF. Over the longer run, well-targeted permanent reductions in budget deficits lead to a considerable increase in both the growth rate and the level of output. The gains may be enhanced by shifting some of the tax burden from incomes to consumption. In the short run, credibility plays a crucial role in determining the size of initial output loses. Global current account imbalances would be significantly reduced if budget consolidation was larger in countries with current account deficits.
Macroeconomic Management When Policy Space is Constrained
The recovery in GDP growth since the global financial crisis has been halting and weak. Concern is widespread that countercyclical policies have run out of space or lack the power to raise growth or deal with the next negative shock. This note argues that room exists for effective policies and that it should be used if appropriate. The most promising route involves a comprehensive, consistent, and coordinated approach to policy making. Comprehensive policy actions within a country exploit synergies, making the whole greater than the sum of parts. Consistent policy frameworks anchor long-term expectations while allowing decisive short- to medium-term accommodation whenever necessary. Coordinated policies across major economies amplify the helpful effects of individual policy actions through positive cross-border spillovers. The findings of this paper indicate that policy coordination adds particular value if the current approach falls short of reviving growth, or in the event of a further downward shock.
The Flexible System of Global Models – FSGM
The Flexible System of Global Models (FSGM) is a group of models developed by the Economic Modeling Division of the IMF for policy analysis. A typical module of FSGM is a multi-region, forward-looking semi-structural global model consisting of 24 regions. Using the three core modules focused on the G-20, the euro area, and emerging market economies, this paper outlines the theory under-pinning the model, and illustrates its macroeconomic properties by presenting its responses under a wide range of experiments, including monetary, financial, demand, supply, fiscal and international shocks.
U.S. Investment Since the Tax Cuts and Jobs Act of 2017
There is no consensus on how strongly the Tax Cuts and Jobs Act (TCJA) has stimulated U.S. private fixed investment. Some argue that the business tax provisions spurred investment by cutting the cost of capital. Others see the TCJA primarily as a windfall for shareholders. We find that U.S. business investment since 2017 has grown strongly compared to pre-TCJA forecasts and that the overriding factor driving it has been the strength of expected aggregate demand. Investment has, so far, fallen short of predictions based on the postwar relation with tax cuts. Model simulations and firm-level data suggest that much of this weaker response reflects a lower sensitivity of investment to tax policy changes in the current environment of greater corporate market power. Economic policy uncertainty in 2018 played a relatively small role in dampening investment growth.
