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About.com Autos Careers Dating & Relationships Education en Español Entertainment Food Health Home Money News & Issues Parenting Religion & Spirituality Sports Style Tech Travel 1 What is a Bank Run? 2 Introduction to the Reserve Ratio 3 Bank Reserves and the Discount Rate 4 Savings and Loan Bailouts 5 Measures

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A bank run (also known as a run on the bank) occurs when, in a fractional-reserve banking system (where banks normally only keep a small proportion of their assets as cash), a large number of customers withdraw cash from deposit account s with a financial institution at the same time because they believe that the finan