After experiencing Black Monday, Ed Yardeni, the president of Yardeni Research, an investment consulting firm that has long been bullish on Wall Street, said that the current global stock market sell-off has some similarities with the 1987 crash. Although investors were also very worried at that time, the US economy ultimately avoided a downturn. So far, this reminds people of 1987, "he said on a program." Our stock market crashed, basically within a day, and there are opinions that we have already or are about to fall into a recession. But this hasn't happened at all. In fact, it's more related to internal factors in the market