We distinguish the economic problems when large financial institutions (“banks”) become insolvent from the political challenges that exist before banks are distressed. These political problems arise because policymakers would like to be able to precommit while a bank is still healthy to refrain from bailing out the bank later, should it become distressed. Political theory and historical experience show that politicians facing unsettled capital markets and highly anxious voters will always bail out the financial institutions that they deem “Too Big To Fail.” As such, the only way for government credibly to commit to refrain from pursuing a Too Big To Fail policy is to break up the largest financial institutions before they become Too Big To ...