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Near the end of the Reagan administration, in October 1987, the stock market lost one quarter of the value of it's market cap, in a single day's trading. In other words, the value of all stocks traded was worth only 75% of what they were worth, the day before. Early the next morning, when the market had not received all the money to cover the loss, the Federal Reserve Chairman was relieved to hear that a bank had offered the NYSE an unauthorized loan, so it could open the next day. The system was saved by the skin of it's teeth. What changes to trading were enacted to prevent a similar occurrence from happening in the future?