Ask Bullwinkle J. Moose about the Federal Reserve’s recently disclosed $7.7 trillion in emergency loans to banks, and he would observe that sum is “antihistamine money. It ain’t nothing to sneeze at.” He would be right; $7.7 trillion is a lot of money. However, much of the story is overblown. Moreover, most commentators skirt the crucial question: If there are financial institutions so large that their failure would throw...

