On October 2, 2010, a clerk at Bear Stearns had erroneously entered an order to sell nearly $4 billion worth of securities. The trader had sent an order to sell $4 million worth. Only $622 million of the orders were executed, and the remainder of the orders were canceled prior to execution. Reports stated that it was a human error, not a computer error, and that it was the fault of the clerk, not the trader. or discussion: What is your assessment of what may have happened and what controls could have prevented this error?

Please be thorough and if possible provide references.