EVERY good horror-film director knows the secret of the “jump scare”. Just when the hero or heroine feels safe, the monster appears from nowhere to startle them. The latest stockmarket shock could have been directed by Alfred Hitchcock. The sharp falls that took place on February 2nd and 5th followed a long period where the only direction for share prices appeared to be upwards.
In fact the American market had risen so far, so fast that the decline only took share prices back to where they were at the start of the year (see chart). And although a 1,175-point fall in the Dow Jones Industrial Average on February 5th was the biggest ever in absolute terms, it was still smallish beer in proportionate terms, at just 4.6%. The 508-point fall in the Dow in October 1987 knocked nearly 23% off the market.