I don't short stocks but it's perfectly legal...some would argue necessary. Although the margin requirements to do so on OTC stocks can be prohibitive logically shorting should be successful on stocks after big runs. Many of these are scams and therefore it would make sense.
I've never found it useful to short. With serious money I'm a long term investor and since the markets have an upward bias long term it's silly to short. With fun/trading money I trade forward momentum. Shorting takes too much work and you could really get burned in the wrong situation
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