What if the UK has Joined the Euro in 1999? An Empirical Evaluation using a Global VAR

We provide a conceptual framework to analysis counterfactual scenarios using macroeconometric models. We consider UK entry to the euro. We derive conditional probability distributions for the difference between the future realisations of variables of interest subject to UK entry restrictions being fully met over a given period, and the alternative realisations without the restrictions. Economic interdependence means that such policy evaluation must take account of international linkages and common factors that drive fluctuations across economies. We use the Global VAR developed by Dees, di Mauro, Pesaran and Smith (2005). The paper briefly describes the GVAR which has been estimated for 25 countries and the euro area over the period 1979-2003. It reports probability estimates that output will be higher and prices lower in the UK and the euro area as a result of entry. It examines the sensitivity of these results to a variety of assumptions about UK entry.