Novice question about trading strategyHello, I am a novice in stock trading. I have one question regarding trading strategy. Let us say i foresee one stock will drop a lot so can i sell it and later buy it back at a lower price? I think it is called "Short sale" in some of the books but is it allowed in singapore market? any restrictions for this practise? BTW, any better strategy in a falling stock market? Thank you for your enlightening.