Bank run
A bank run or run on the bank occurs when many clients withdraw their money from a bank, because they believe the bank may fail in the near future. It may occur when, in a fractional-reserve banking system (where banks normally only keep a small proportion of their assets as cash), a large volume of customers seek to withdraw a greater amount of cash from deposit accounts with a financial institution in a short space of time than the institution has cash on-hand, because the customers believe that the institution is, or might become, insolvent.