Most people react the wrong way to stock prices. They feel good when their stocks go up and bad when they go down.

Your partner in investing is Mr Market. He's obliging. He comes around every day and tells you what he'll pay you for your interest in the business or what he'll sell you. Sometimes Mr Market will let his fears or enthusiasm run away with him. Sometimes his ideas will look plausible and justified by business developments. Use this to your advantage.

Don't first look at the value of the stock because that will influence your opinion of it. Instead, look at past performance.

Buffett says that if you were driving a lorry weighing 9,800lbs, you would not feel comfortable driving across a bridge built to carry 10,000lb. There is not enough margin of safety.

Always leave a margin of safety. Don't try to cut things so close. You wait until something kind of shout...