Mr Draaisma, who called the top of the bull market almost to the day in mid-2007, has crunched the worldwide data on 19 major stock market crashes over the last century. They show that the typical rebound rally (as opposed to bear trap rallies, when markets later plunge to new lows) lasts 17 months and stocks rise 71pc. The 1993 rally in the US was 170pc over 13 months. Finland's rally in 1994 was 295pc. Hong Kong rallied 159pc in 2000. This rebound is only five months old. The key indexes have risen 49pc in the US and 42pc in Europe. Mr Draaisma advises clients to stay in the stocks for now, but stick to telecom companies, utilities, and oil.