Der deutsche Konjunkturzyklus: Vermessung und Zusammenhang mit Investitionen

On average, the German business cycle is four to five years long. The cycle is quite pronounced and explains about 27 % of the variation in year on year GDP growth. For fluctuations with a duration of more than two years, there is a significant unidirectional Granger causality running from GDP growth to investment. A closer look reveals two things: first of all, that the Granger causality runs from GDP to investment in equipment and machinery, not investment in construction, and second, that it is lagged foreign demand (exports) rather than domestic demand that has predictive power for investment.