They are not just two of the biggest names in insurance, but they are two of the biggest names in the financial world - so much so that American International Group (AIG) and Prudential Financial are, apparently, "too big to fail". The label "too big to fail" is a tag slapped on "systematically important" financial institutions (or Sifis for short) - in other words, businesses or financial organizations that are of such importance to a country’s economy that its central bank or government feels it must take measures to prevent it from ceasing to trade or going bankrupt.