Before revision:  The widespread effects of the current EU debt crisis and the 2008 world financial crisis occur because financial systemsare characterized by complex relations that allow a local crisis to spread dramatically. We study US commercial bank balance sheet data and design a bi-partite banking network composed of (i) banks and (ii) bank assets .
After revision:  To study the systemic risk of financial systems, we create a bi-partite banking network composed of (i) banks and (ii) bank assets .