For the private investor 1971 should have been a year to make big money on the Stock Exchange. Share prices started the year low but finished it at an all-time high level. However, many investors failed to grasp the opportunity. How could they have done better, when are the best times to buy and sell, in what sectors might more be made of their money? One man who should have plenty of answers is Jim Slater, head of the giant financial empire, Slater-Walker. In tonight's Money Programme he gives his advice on how private investors can maximise their profits.