Using the definition of portfolio variance, prove that a perfectly hedged stock portfolio that is 100 shares

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Using the definition of portfolio variance, prove that a perfectly hedged stock portfolio that is 100 shares long and 100 shares short is perfectly risk free.
Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...
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Financial Theory and Corporate Policy

ISBN: 978-0321127211

4th edition

Authors: Thomas E. Copeland, J. Fred Weston, Kuldeep Shastri

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