Benjamin L Hunt

GEM; A New International Macroeconomic Model

Over the past two years, the IMF staff has been developing a new multicountry macroeconomic model called the Global Economy Model (GEM). This paper explains why such a model is needed, how GEM differs from its predecessor model, and how the new features of the model can improve the IMF’s policy analysis. The paper is aimed at a general audience and avoids technical detail. It outlines the motivation, structure, strengths, and limitations of the model; examines three simulation exercises that have been completed; and discusses the future path of GEM.

Getting to Know GIMF : The Simulation Properties of the Global Integrated Monetary and Fiscal Model

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.

The Zero Interest Rate Floor (ZIF) and its Implications for Monetary Policy in Japan

This paper uses the IMF’s macroeconomic model MULTIMOD to examine the implications of the zero interest rate floor (ZIF) for the design of monetary policy in Japan. Similar to findings in other studies, targeting rates of inflation lower than 2.0 per cent significantly increases the likelihood of the ZIF becoming binding. Systematic monetary policy strategies that respond strongly to stabilise output and inflation, or that incorporate some explicit price-level component, can help to mitigate the implications of the ZIF.

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.

Oil Price Shocks; Can they Account for the Stagflation in the 1970's?

Using a variant of the IMFs Global Economy Model (GEM), featuring energy as both an intermediate input into production and a final consumption good, this paper examines the macroeconomic implications of large increases in the price of energy. Within a fully optimizing framework with nominal and real rigidities arising from costly adjustment, large increases in energy prices can generate an inflation response similar to that seen in the 1970s if the monetary authority misperceives the economys supply capacity and workers resist the erosion in their real consumption wages resulting from the price increase. In the absence of either of these two responses, the model suggests that energy price shocks cannot generate the type of stagflation witnessed in the 1970s. Further, even allowing for these two effects, the results do not suggest that the increase in the price of oil in late 1973 and early 1974 can fully explain the extent of the slowing in real activity or the magnitude of the acceleration in inflation experienced in the United States in 1974 and 1975.

Stabilizing Inflation in Iceland

This paper provides some empirical estimates on how tightly is it feasible to control inflation in a very small open economy such as Iceland. Estimated macroeconomic models of Canada, Iceland, New Zealand, the United Kingdom, and the United States are used to derive efficient monetary policy frontiers that trace out the locus of the lowest combinations of inflation and output variability that are achievable under a range of alternative monetary policy rules. These frontiers illustrate that inflation stabilization is more challenging in Iceland than in other industrial countries primarily because of the relative magnitudes of the economic shocks.

Is Japan’s Population Aging Deflationary?

Japan has the most rapidly aging population in the world. This affects growth and fiscal sustainability, but the potential impact on inflation has been studied less. We use the IMF’s Global Integrated Fiscal and Monetary Model (GIMF) and find substantial deflationary pressures from aging, mainly from declining growth and falling land prices. Dissaving by the elderly makes matters worse as it leads to real exchange rate appreciation from the repatriation of foreign assets. The deflationary effects from aging are magnified by the large fiscal consolidation need. Many of these factors will beset other advanced countries as well, but we find that deflation risk from aging is not inevitable as ambitious structural reforms and an aggressive monetary policy reaction can provide the offset.

The Macroeconomic Effects of Higher Oil Prices

The paper uses MULTIMOD to analyze the macroeconomic effects of oil price shocks, distinguishing between temporary, more persistent, and permanent shocks. It provides perspectives on several findings in the literature and the key role of monetary policy in influencing macroeconomic outcomes. Specific attention is paid to the channels through which oil price increases can pass through into core inflation, a possible explanation of the asymmetric relationship between oil prices and economic activity, the role of monetary policy credibility, the implications of delayed policy responses, and the relative merits of leaning in different directions when the correct policy response is uncertain.

The Declining Importance of Tradable Goods Manufacturing in Australia and New Zealand: How Much Can Growth Theory Explain?

In this paper, the IMFs new Global Economy Model (GEM) is used to estimate the contribution of unbalanced growth to the decline in the share of goods production in Australia and New Zealand. The simulation results suggest that faster productivity growth in the tradable goods sector in Australia, New Zealand, and their major trading partners accounts for a significant portion of the relative decline in the importance of goods production. Over the 1995 to 2004 period, unbalanced growth explains more than 80 percent of the decline in goods production in both countries.

A Comparison of the Properties of NZM and FPS

The New Zealand Treasury and the Reserve Bank of New Zealand both maintain and use comprehensive macroeconomic models of the New Zealand economy: NZM and FPS respectively. In this paper, shocks are applied to the two models to illustrate and compare their dynamic properties. The most notable differences arise from their characterisations of the inflation process. In NZM, inflation is modelled as a cost-push phenomenon, whereas FPS models inflation as a demand pull process. Consequently, shocks arising from demand and cost sources often have quite different implications for monetary policy in the two models. In contrast, in general the long-run responses of the models to permanent shocks are quite similar, although the transition paths differ reflecting both the differing inflation processes and adjustment dynamics.