Capital serves as a primary cushion against operating losses and unexpected losses in the value of assets (such as the failure of a loan). FIs need to hold enough capital to provide confidence to uninsured creditors that they can withstand reasonable shocks to the value of their assets. In addition, the FDIC, which guarantees deposits, is concerned that sufficient capital is held so that their funds are protected, because they are responsible for paying insured depositors in the event of a failure. Finally, capital also serves as a source of financing to purchase and invest in assets.