Looking for title of short story or chapter from science fiction book I read in the early 70’s. A group of men are at lunch, and one or more members of the group has something to share about his bank account. It appears that a computer error has made these guys rich. One member of the group has thoughts about machines taking over from humanity. After a short discussion, the lights blink on and off, then stay off for good. Any help would be much appreciated. Thank you.