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long(100%)-short(-100%) investment explanation
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if you mean the percentages of long/short positions within a mutual fund or etf, then it's a percentage of the total value of the fund portfolio. in that case, positions of 50% in x, -50% in y are not the same as 100% in x, -100% in y. if the long and short positions are both for the same asset, then, as d stanley mentions, all that matters is the net position. if you're equally long and short x, then the net position is always 0%.
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