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Why does financial investor bother to buy derivatives and then hedge the position?
I don't know why a financial investor or a retail trader would do this. But I can guess why a market maker in options would do this. Let us say you buy an option from an option market maker and the market maker sold the option to you. He made a small profit in the bid-ask spread but now he is holding a short position in the option with unlimited risk exposure. So to protect himself, he will take an offsetting position in the underlying and become delta neutral, so that his position is not affected by the moves in the underlying. In the end, he can do this because he is not in the market to make money by betting on direction, unlike the rest of us poor mortals. He is making money from the bid-ask spread. So to ensure that his profits are not eroded by an adverse move in the underlying, he will continuously seek to be delta neutral. But once again, this is for a market maker. For market takers like us, I still don't understand why we would need to delta hedge.