Johansen, Søren; Juselius, Katarina - In: Journal of Econometrics 178 (2014) P2, pp. 310-315
It is well known that if Xt is a nonstationary process and Yt is a linear function of Xt, then cointegration of Yt implies cointegration of Xt. We want to find an analogous result for common trends if Xt is generated by a finite order VAR with i.i.d. (0,Ωx) errors εxt. We first show that Yt...