By David Haggith: David Haggith Shares of 3M Co. plummeted toward its biggest one-day decline in over 30 years, after the industrial, health-care and consumer products company reported missed profit and revenue expectations, slashed its full-year outlook, and said it was cutting 2,000 jobs…. The percentage decline was second only to the 26% plunge on Oct. 19, 1987. That is the day referred to as Black Monday, with the Dow registered its biggest-ever one-day crash with a 22.6% tumble.