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Related Hedges (How do they work?)
In this type of strategy profit is made when the shares go down as your main position is the short trade of the common stock. The convertible instruments will tend to move in about the same direction as the underlying (what it can be converted to) but less violently as they are traded less (lower volatility and lower volume in the market on both sides), however, they are not being used to make a profit so much as to hedge against the stock going up. Since both the bonds and the preference shares are higher on the list to be repaid if the company declares bankruptcy and the bonds pay out a fixed amount of interest as well, both also help protect against problems that may occur with a long position in the common stock.  Essentially the plan with this strategy is to earn fixed income on the bonds whilst the stock price drops and then to sell both the bonds and buy the stock back on the market to cover the short position. If the prediction that the stock will fall is wrong then you are still earning fixed income on the debt and are able to convert it into stock at the higher price to cover the short sale eliminating, or reducing, the loss made on the short sale. Effectively the profit here is made on the spread between the price of the bond, accounting for the conversion price, and the price of the stock and that fixed income is less volatile (except usually in the junk market) than stock.