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A Bank run (also known as a run on the bank) is a type of financial crisis. It is a panic which occurs when a large number of customers of a bank fear it is insolvent and withdraw their deposits.

A run on the bank begins when the public begins to suspect that a bank may become insolvent. As a result, individuals begin to withdraw their savings. This action can destabilize the bank to the point where it may in fact become insolvent. Banks retain only a fraction of their deposits as cash (see fractional-reserve banking): the remainder is issued as loans. As a result, no bank has enough reserves on hand to cope with more than the fraction of deposits being taken out at once, and will 'call in' the short term deposits itself has made. This can cause a shortage of Market liquidity in the short term money market.

As a bank run progresses, it generates its own momentum. As more people withdraw their deposits, the likelihood of default increases, so other individuals have more incentive to withdraw their own deposits. If many or most banks were to suffer runs at the same time, then the resulting chain of bankruptcies can cause a long economic recession.

To prevent bank runs, Central banks can prevent financial institutions from failing by:
 * Deposit insurance systems insure each depositor up to a certain amount, therefore the depositors' savings are protected even if the bank fails. This removes the incentive to withdraw deposits simply because others are withdrawing theirs if consumers trust the insurance system.
 * Central banks act as a lender of last resort. To prevent a bank run, the Central Bank guarantees that it will make short-term, high-interest loans to banks, to ensure that, if they remain economically viable, they will always have enough liquidity to honour their deposits.
 * Reserve ratios and Tier 1 capital thresholds both limit the proportion of deposits which a bank can loan out.