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abstract

This paper examines the asymmetry of the loss functions of the Japanese government, the International Monetary Fund (IMF), and private forecasters for Japanese output growth and inflation forecasts. It tests the rationality of the forecasts, assuming a possibly asymmetric loss function. The results indicate considerable evidence of asymmetry. The 15-month forecasts are overpredicted, irrespective of forecaster identity or the target variable. However, the biases in the three-month forecasts vary among forecasters: the IMF provides prudent short-term forecasts for output growth and inflation, while private forecasters provide unbiased inflation forecasts. The government uses the information provided in the IMF and consensus forecasts efficiently when making its own forecasts. A comparison with the projections for the German economy indicates that the biases of the Japanese government may be attributable to its debt-to-GDP ratio, which is the highest among advanced economies. © 2015 International Institute of Forecasters. Published by Elsevier B.V. All rights reserved.

6. Conclusion

This paper has examined the asymmetry of the loss functions of the Japanese government, the IMF, and private forecasters for Japanese output growth and inflation forecasts. It has also tested the rationality of the forecasts under the assumption of a possibly asymmetric loss function. The paper has found considerable evidence of asymmetry. The 15-month forecasts are overpredicted, irrespective of the forecasting identities and target variables. However, the biases in the three-month forecasts vary among the forecasters. The IMF provides prudent shortterm forecasts for output growth and inflation, and private forecasters provide unbiased inflation forecasts. The Japanese government uses the information provided by the IMF and private forecaster forecasts efficiently when making its own forecasts.