the height of the post-2007 crisis, major banks demanded and received massive government help on the basis of a threat. They were, they insisted, “too big to fail.” The idea seemed to be that letting them collapse or default would have such devastating consequences for the larger economy that the government had to help them “in the national interest.” The fallout from the collapse of the Lehman Brothers investment bank was used as the perfect example of why such a “colossal mistake” could not be replicated. They used such arguments in public and congressional debates, eventually garnering trillions of dollars in government support.