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.
英
美
- 1988年2月4日，紐約股票交易所制定出安全措施，規定每當道瓊斯工業(yè)股票指數在一天之中上升或下降50個(gè)百分點(diǎn)時(shí)，禁止使用該交易所的電子指令系統來(lái)進(jìn)行程控交易。
