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Margin trading involves interest charges and risks, including the potential to lose more than deposited or the need to deposit additional collateral in a falling market. Before using margin, customers must determine whether this type of trading strategy is right for them given their specific investment objectives, experience, risk tolerance, and financial situation. For more information please see Robinhood Financial’s Margin Disclosure Statement, Margin Agreement and FINRA Investor Information. These disclosures contain information on Robinhood Financial’s lending policies, interest charges, and the risks associated with margin accounts.
History has shown that investing in stocks is one of the easiest and most profitable ways to build wealth over the long-term. With a handful of notable exceptions, almost every member of the Forbes 400 list of the wealthiest people got there because they own a large block of shares in a public or private corporation. Although your beginning may be humble, this guide to investing in stocks will explain what stocks are, how you can make money from them, and much more.
When you've been approved for margin stock trading, you're also eligible to short stock. Almost every successful stock trader has shorted stock at one time or another. When you short stock, you make money when the company's shares fall—or, even better yet, when they crash. The problem is that you can expose yourself to unlimited liability when you do this. 
Momentum investing usually involves a strict set of rules based on technical indicators that dictate market entry and exit points for particular securities. Momentum investors sometimes use two longer-term moving averages, one a bit shorter than the other, for trading signals. Some use 50-day and 200-day moving averages, for example. The 50-day crossing above the 200-day creates a buy signal. A 50-day crossing back below the 200-day creates a sell signal. A few momentum investors prefer to use even longer-term moving averages for signaling purposes.