The Rules of Trading

Mauldin presents a chapter from his book Just One Thing. It is Dennis Gartman's Rules of Trading

R U L E # 1

Never, ever, under any circumstance, should one add to a losing position ... not EVER!

Averaging down into a losing trade is the only thing that will assuredly take you out of the investment business. This is what took LTCM out. This is what took Barings Brothers out; this is what took Sumitomo Copper out, and this is what takes most losing investors out. The only thing that can happen to you when you average down into a long position (or up into a short position) is that your net worth must decline. Oh, it may turn around eventually and your decision to average down may be proven fortuitous, but for every example of fortune shining we can give an example of fortune turning bleak and deadly.

By contrast, if you buy a stock or a commodity or a currency at progressively higher prices, the only thing that can happen to your net worth is that it shall rise. Eventually, all prices tumble. Eventually, the last position you buy, at progressively higher prices, shall prove to be a loser, and it is at that point that you will have to exit your position. However, as long as you buy at higher prices, the market is telling you that you are correct in your analysis and you should continue to trade accordingly.

[On the other hand, there's investor Bill Miller.]