A bad trade is like a dead fish: The longer you keep it, the worse it stinks.
When a trade is making money, the market is telling them they are right and to let the position ride.
Don't ever do this ...
Winners don't add to, or "average", losing positions. They dump the trade and go looking for a new opportunity. Successful investors may add to the winning trades. When ahead, they press their advantage while remembering that at any time the market can turn on them and prove them wrong.
In trading keep your mind clear and do not get emotional about a trade. Remember you are not married to a stock rather you are in the dating game.
Co-founder of MarketClub