It's very difficult for any particular segment of the stock market to sustain superior performance. The watch word for our financial markets is, "reversion to the mean" i.e. what goes up must come down, and it's true more often than you can imagine.

In Las Vegas we all know that it's the croupiers who win. At the race track, it's those who control the handle who win. State lotteries, does anybody think the participants in the lottery win? No. The state wins.

If you're very talented and keep winning, you'll do just fine. It may take a while. But the talent is hard to identify and talent is hard to tell from luck. There's an awful lot of luck in this business. Past performance is not helpful in judging future performance.

Yes, the investor is often his own worst enemy. Yes, the marketing colossus known as the mutual fund industry provides the weaponry which enables investors to indulge their suicidal instincts. No, the fund industry was hardly an innocent bystander in the market boom and the subsequent carnage. "We have met the enemy and he is us"... all of us.

Managed funds are astonishingly tax-inefficient.

Hint: money flows into most funds after good performance, and goes out when bad performance follows.

If you have trouble imagining a 20% loss in the stock market, you shouldn't be in stocks.