Orthodoxy rules out providing ECB support to a particular country, because this would violate the separation between monetary and fiscal policy: The authority to commit public resources to the benefit of a particular country belongs exclusively to parliaments, not the central bank. But a wholesale purchase of government bonds does not raise similar concerns.
对欧盟条约的正统诠释反对欧洲央行向某一特定国家提供援助，因为这将破坏货币和财政政策两者的各自独立：为了某特定国家的利益而调拨公共资源的权限只属于议会，而非央行。但批量采购各国政府债券则不会产生类似的担忧。