A run on a bank occurs when a large number of depositors, fearing that their bank will be unable to repay their deposits in full and on time, simultaneously try to withdraw their funds immediately. This may create a problem because banks keep only a small fraction of deposits on hand in cash; they lend out the majority of deposits to borrowers or use the funds to purchase other interest-bearing assets such as government securities. When a run comes, a bank must quickly increase its cash to meet depositors' demands. It does so primarily by selling assets, often hastily and at fire-sale prices. As banks hold little capital and are highly leveraged, losses on these sales can drive a bank into insolvency. MORE

James Buchanan is the cofounder, along with Gordon Tullock, of public choice theory. Buchanan entered the University of Chicago's graduate economics program as a "libertarian socialist." After six weeks of taking Frank Knight's course in price theory, recalls Buchanan, he had been converted into a zealous free marketer. MORE