“…1 Whether business cycles in the euro area have become more similar across its member states is a controversial issue. Numerous studies (e.g., Altavilla, 2004;Artis & Zhang, 1997, 1999Artis et al, 2004;Darvas & Szapary, 2004;Becker & Hall, 2009;Kose et al, 2008;Lumsdaine & Prasad, 2003;Mansour, 2003;Mumtaz et al, 2011;Monfort et al, 2003) find evidence of more synchronization in economic activity across core EU countries in the period of transition to the EMU, but the effect of national borders has remained remarkably strong. In line with Mundell's (1961) theory of optimal currency areas, Artis and Zhang (1997), and Frankel and Rose (1998) argue that business cycles among members of the Exchange Rate Mechanism -the predecessor of EMU -became more synchronized after pegging their exchange rates.…”