Don’t sell just because the stock is coming down. You have the option to add more and generate more wealth in the long run too. If the stock is going down because there are terrible news and there seems no end to it, you may as well exit and buy something else. However if it’s a short term predicament and you believe the stock
will do good in the long run, add more or as one calls it “average” buy buying more and let the stock reward you once it gets through these so called hurdles.