The paper subjects seven structural DSGE models, all used heavily by policymaking institutions, to discretionary fiscal stimulus shocks using seven different fiscal instruments, and compares the results to those of two prominent academic DSGE models. There is considerable agreement across models on both the absolute and relative sizes of different types of fiscal multipliers. The size of many multipliers is large, particularly for spending and targeted transfers. Fiscal policy is most effective if it has moderate persistence and if monetary policy is accommodative. Permanently higher spending or deficits imply significantly lower initial multipliers. (JEL E12, E13, E52, E62)

This paper re-examines the implications, risks, and attendant policies surrounding global rebalancing of current accounts through the lens of a dynamic, multi-region model of the global economy. In the baseline scenario, world macroeconomic imbalances of the early 2000s can be attributed to a combination of six related but distinct tendencies: (i)expansionary U.S. fiscal policy, (ii) declining rate of U.S. private savings, (iii) increased foreign demand for U.S. assets, particularly in Asia, (iv) strong productivity growth in emerging Asia, (v) lagging productivity growth in Japan and the euro area, and (vi) gaining export competitiveness in emerging Asia. The baseline projects stabilizing U.S. public and foreign debt (albeit at higher levels) and a gradual depreciation of the dollar, allowing the U.S. external deficit to gradually move to a sustainable level. An alternative scenario, involving a sudden portfolio reshuffling in the rest of the world, would result in higher U.S. real interest rates, a significantly weaker dollar, with harmful effects on U.S. (and possibly global) growth. More flexible exchange rates in emerging Asia can help reduce variability in both regional output and inflation. Other simulations consider the effects of U.S. fiscal adjustment, as well as growth-enhancing structural reforms in Europe and Japan.

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 underpinning 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.

Wide-ranging structural reforms are underway in Italy, aimed at addressing key bottlenecks in the product and labor markets. Our analysis, based on the IMF's Global Integrated Monetary and Fiscal model (GIMF), attempts to quantify the potential gains to the economy from a comprehensive package of structural reforms. We find that these gains can be sizeable. While in most cases, the reforms go in the right direction, their impact would depend on effective and timely implementation. In some areas, especially in the labor market, reforms would benefit from further strengthening. The priorities should be to strengthen competition in the non-tradable sector and make the labor market more efficient and inclusive, supported by growth-friendly fiscal reforms.

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Given the backdrop of pressing infrastructure needs, this paper argues that higher German public investment would not only stimulate domestic demand in the near term and reduce the current account surplus, but would also raise output over the longer-run as well as generate beneficial regional spillovers. While time-to-build delays can weaken the impact of the stimulus in the shortrun, the expansionary effects of higher public investment are substantially strengthened with an accommodative monetary policy stance-as is typical during periods of economic slack. The current low-interest rate environment presents a window of opportunity to finance higher public investment at historically favorable rates.

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