The financial crisis provided a stark example of how interconnected the financial system is. Since then, researchers have developed several ways to monitor patterns of connectedness within the banking system. A key challenge is removing the impact of conditions that affect all banks in order to highlight evidence of direct connectedness. A new measure filters these common factors from bank stock market data. Estimates using this method show how different assumptions can affect conclusions about the connections among banks. In September 2008, the bankruptcy of Lehman Brothers quickly spread to other financial ... (full story)