Before you take a position in a stock you should research the stock to find out what it is worth. If a share is worth more than the current price you should bu

Before you take a position in a stock you should research the stock to find out what it is worth. If a share is worth more than the current price you should buy it. If it worth less than the current price you should short sell it. If you don't short sell, then half of your research is wasted.