Too big to fail
concept that certain corporations or financial institutions are so large and interconnected that their failure would be disastrous to the greater economic system, and that they therefore must be supported by government when facing potential failure
Too big to fail or too big to jail is a theory of economics as well as a pejorative term for corporate welfare supposedly being necessary because the businesses that receive it are considered so vital to the economy that should they fail and go under, the whole economic system might fall apart.