A file extension is the characters after the last dot in a file name. For example, in the file name winmail.dat, the file extension is dat. It helps Windows select the right program to open the file.
Margin is borrowing money from your broker to buy a stock and using your investment as collateral. Investors generally use margin to increase their purchasing power so that they can own more stock without fully paying for it.But margin exposes investors to the potential for higher losses.ut if you bought the stock on margin  paying $25 in cash and borrowing $25 from your broker  you'll earn a 100 percent return on the money you invested. Of course, you'll still owe your firm $25 plus interest.
Q: What is General Electric's market cap, and what does it mean? A: A company's market capitalization reflects the value the stock market is placing on it right now. To get it, you multiply the total number of shares outstanding by the stock price. The result can help you get a sense of whether the firm is overvalued or undervalued if you compare it to peers. In GE's case, 10.5 billion shares times a stock price of about $20.70 yields a market cap of $217 billion.