The US system is manageable, because the American states are largely constrained to running balanced budgets, while the federal government accounts for most fiscal policy. Moreover, banking regulation and deposit insurance are centralized in the US, as they must be in a monetary union.
美国的体系可以做到这一点，因为各州都在很大程度上被强制保持预算平衡，而联邦政府则为大部分财政政策负责。此外，美国的银行监管和存款保险都被收归联邦，因为它们必须存在于一个货币联盟之中。欧元区最终也意识到了这一点。