It is well-known that economic and financial time series are characterized by nonlinearities. The literature does not agree, however, on the actual causes of such nonlinearities. In this paper, I investigate whether dynamics at different frequencies present different degree of nonlinearity, and...

We discuss the properties of business cycles in Romania between 1991 and 2011 using a wavelets based method. We compare it with the standard approaches in literature. We analyze the relationship between output and key macroeconomic variables in time and frequency. While in terms of comovement...

We reassess the relationship between money and output using quarterly data from the US economy. We use several tools based on wavelets, the wavelet power transform and the wavelet coherence with which we analyze this relationship in both time and frequency. We find evidence of a weaker...