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Why the difference? Part of the reason is that the Invesco Momentum ETF is a long-only portfolio—it has no short bets that can go against it. The rest of the difference can be attributed to the timing and frequency of its rebalances: The Invesco Momentum ETF rebalanced only twice a year in March and last September, while the earlier-mentioned long-short strategy does it quarterly, the latest ones in February and last November.
This might finally make momentum stocks attractive again amid the elevated level of uncertainty in the market today. Things have improved a lot for the factor since late last year, according to Bernstein’s McCarthy. Thanks to the more diversified sector composition, correlation among high-momentum stocks has fallen sharply, which means they are less likely to crash together in case of volatility.
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. 

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Forums can be another source for question and answer. Two recommendations include Elite Trader and Trade2Win. Just be careful of who you listen to. The vast majority of participants are not professional traders, let alone profitable traders. Heed advice from forums with a heavy dose of salt and do not, under any circumstance, follow trade recommendations.
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