ENTJ We prefer to take on trading and everyday life with a clear head. It didn't take long for me to find out that emotional trading is the best way to give my money away.
I'm not sure that INTJ's would make very good traders. I think one of the conflicts INTJ's would have with the markets is you can't impose structure and order on to it. This is why engineers in general (INTJ types) have such a hard time with trading. You can't develop the perfect system or perfect indicator to trade. The market is much more oganic and free flowing and dynamic and constantly changing and more often then not, the market moves contrary to logic. I would think INTJ's struggle with this daily and you see a lot of that on ET with the countless threads of asking why the market is moving higher in the wake of all the bad economic data, rising oil prices, falling dollar, etc. It's interesting to see so many INTJ's on here as I would suspect most of ET to fall into that category by the thread topics you see on a daily basis.