The success of the legendary banking family helped to usher in the Italian Renaissance and thus change the world. Now, Italian banks seem poised to alter the world yet again.

Shares of Italy's largest financial institutions have plummeted in the opening months of 2016 as piles of bad debt on their balance sheets become too high to ignore.  Amid all of the risks facing EU members in 2016, the risk of contagion from Italy's troubled banks poses the greatest threat to the world's already burdened financial system.

At the core of the issue is the concerning level of Non-Performing Loans (NPL's) on banks' books, with estimates ranging from 17% to 21% of total lending.  This amounts to approximately €200 billion of NPL's, or 12% of Italy's GDP.  Moreover, in some cases, bad loans make up an alarming 30% of individual banks' balance sheets.