as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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does an index have a currency?
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more importantly, index funds are denominated in specific currencies. you can't buy or sell an index, so it can be dimensionless. anything you actually do to track the index involves real amounts of real money.
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