The change in stock price is the difference between the opening stock price and the current price the stock is selling at. The quantity of a person's order is the number of shares a person is buying. If the quantity is 50 then the person is buying 50 shares of that stock. This index is used as a measure of performance of the overall market. Considered by many to be a much more accurate picture of the market in general.
Sales charge A transaction fee or commission paid for an investment instrument.
The reverse of the usual stock market technique, short selling is based on the anticipation that a particular security price will go down. The practice of short selling involves borrowing shares of a security from your broker and immediately selling them at the current price. Then, as the price of that security declines, you buy back an equal number of shares on the open market and use them to cover the shares you borrowed from your broker, and make a profit. Short sellers lose when the price of the stock ascends rather than descends. Theoretically, there is more risk involved with short selling because a stock price could continue to rise forever.