Question
An investor looking to protect himself from the downside
risk should use which of the following derivatives?Solution
  Buying a stock and put option on that will give protection against the downside   risk. If the price of the stock falls to even zero then the put option can be exercised and amount equivalent to exercise price can be recovered (against the payment of premium). If the price of the stock rises then put will simply expire worthless (against a payment of premium).
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