In this paper we examine a model of cointegration where long-run param
eters are subject to switching between several different cointegrating
regimes. These shifts are allowed to be governed by the outcome of an
unobserved Markov chain with unknown transition probabilities. We ill
ustrate this approach using Japanese data on consumption and disposabl
e income, and find that the data favour a Markov-switching long-run re
lationship over a standard temporally stable formulation. (C) 1997 by
John Wiley & Sons, Ltd.