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Using quarterly data for the Federal Republic of Germany, we generate four-quarter-ahead forecasts for real GDP growth. Throughout the 1970s and 1980s, other monetary indicators like real M1 or short-run interest rates clearly outperform forecasts which are based on interest rate spreads. This holds for within as well as for ex-post predictions. The same holds for the development after 1992. Moreover, it is shown that simple forecasts based on M1 or on short-run interest rates outperform the common biannual GNP forecasts of the group of German economic research institutes. [ABSTRACT FROM AUTHOR]