With some members inside of the eurozone, and others remaining outside of it, and with disparate economic interests and monetary and fiscal traditions even within the eurozone, agreement is difficult. That sets the stage for three broad scenarios, each with implications for the European and global economy, the financial and banking system, and relations between the member states and EU institutions.
里斯本条约强调决策的一致同意。里斯本条约缔约国既有欧元区成员国，也有非欧元区成员国，每个国家都有不同的经济利益和货币和财政传统（即使同处于欧元区的国家也不例外），因此达成一致是很困难的。这就次年改成了三个大方向，每一个都对欧洲和全球经济、金融和财政体系以及欧盟成员国和欧盟机构之间的关系具有影响。