On February 4, 1988, the New York Stock Exchange established safeguards which forbid the use of its electronic order system for program trading whenever the Dow-Jones Industrial Average increases or drops 50 points in a single day.

• 1988年2月4日，纽约股票交易所制定出安全措施，规定每当道琼斯工业股票指数在一天之中上升或下降50个百分点时，禁止使用该交易所的电子指令系统来进行程控交易。