This hedging technique is frequently used by institutional investors when the market direction is uncertain or volatile. Short selling index futures can offset any downturns, but it also hinders any gains.
Portfolio insurance is an investment strategy where various financial instruments such as equities and debts and derivatives are combined in such a way that degradation of portfolio value is protected. It is a dynamic hedging strategy which uses stock index futures. It implies buying and selling securities periodically in order to maintain limit of the portfolio value. The working of portfolio insurance is akin to buying an index put option, and can also be done by using listed index options.
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