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

How should I decide whether to buy more shares of a stock when its price drops?
There is no way to find out what future will be if you have only quote from past. In other words, nobody is able to trade history successfully and nobody will be able, ever. Quote's movement is not random. Quote is not price. Because brokerage account is not actual money. Any results in past do not guarantee you anything. Brokerage accounts should only have portions of money which you are ready to loose completely. Example: Investment firms recommended buying falling Enron stocks, even when it collapsed 3 times, then - bankrupt, suddenly. What a surprise!