The paper shows how to calculate permanent and transitory innovations a la
Blanchard and Quah (American Economic Review, 79 (1989) 655-673) from a coi
ntegrated VAR model. This is important for two reasons: first, it clarifies
the relation between the two decompositions (they are equivalent) and seco
nd, it simplifies the procedure of actually computing the structural innova
tions. (C) 1999 Elsevier Science S.A. All rights reserved.