The history of economic recessions has shown that every deep downturn has been accompanied by disruptions in the financial sector.Paradoxically, up until the financial world crisis of 2007-2009, little attention was given to macroeconomic and financial interdependence.In this paper, a study is conducted on the relationship between financial and real business cycles for a sample of thirty-three countries in the frequency domain.Specifically, the features of the interdependence of credit and output cycles are analysed and Granger-type causality tests are carried out in the frequency domain.The main findings of the study indicate that the likelihood of cycle interdependence is highest when considering medium and long-term frequencies, and that Granger causality runs in both directions.