Offer your thoughts or opinion on the input financial query or topic using your financial background.

One of my stocks dropped 40% in 2 days, how should I mentally approach this?
From some of your previous questions it seems like you trade quite often, so I am assuming you are not a "Buy and Hold" person. If that is the case, then have you got a written Trading Plan? Considering you don't know what to do after a 40% drop, I assume the answer to this is that you don't have a Trading Plan. Before you enter any trade you should have your exit point for that trade pre-determined, and this should be included in your Trading Plan. You should also include how you pick the shares you buy, do you use fundamental analysis, technical analysis, a combination of the two, a dart board or some kind of advisory service? Then finally and most importantly you should have your position sizing and risk management incorporated into your Plan. If you are doing all this, and had automatic stop loss orders placed when you entered your buy orders, then you would have been out of the stock well before your loss got to 40%. If you are looking to hang on and hoping for the stock to recover, remember with a 40% drop, the stock will now need to rise by 67% just for you to break even on the trade. Even if the stock did recover, how long would it take? There is the potential for opportunity loss waiting for this stock to recover, and that might take years. If the stock has fallen by 40% in a short time it is most likely that it will continue to fall in the short term, and if it falls to 50%, then the recovery would need to be 100% just for you to break even. Leave your emotions out of your trading as much as possible, have a written Trading Plan which incorporates your risk management. A good book to read on the psychology of the markets, position sizing and risk management is "Trade your way to Financial Freedom" by Van Tharp (I actually went to see him talk tonight in Sydney, all the way over from the USA).