On February 5, the SP500 experienced a drop of 4% in a day. We ask ourselves the question: is a one-day 4% drop a common occurrence? The table below shows the number of 4% (or more) down days since 1970.
|4% down||4% down and bullish|
On average, a 4% down day occurred each 1.2 years, which is probably not a rare occurrence.
We next counted the number of days when the SP500 dropped 4% or more during a bull market. We defined the bull market as price > 200-Day simple moving average. Since 1970 there have been 5 occurrences, i.e. on average once every 10 years. We don’t know whether this qualifies as a black swan event, but a drop of more than 4% during a bull market is indeed very rare.
The table below shows the dates of such occurrences. It’s interesting to note that before the February 5 event, the last two 4% drops when price> 200-day SMA occurred around the dot-com period.
|September 11, 1986||-4.8|
|October 13, 1989||-6.1|
|October 27, 1997||-6.9|
|April 14, 2000||-5.8|
|February 5, 2018||-4.1|