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24 March, 21:54

Show that Black-Scholes call option hedge ratios also increase as the stock price increases. Consider a 1-year option with exercise price $50, on a stock with annual standard deviation 20%. The T-bill rate is 3% per year. Find N (d1) for stock prices $45, $50, and $55.

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  1. 25 March, 00:01
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    Check explanation.

    Explanation:

    A call option hedge ratio shows how an option price with respect to price changes in the underlying stock. A call option hedge ratio is used in determining the number of shares of stocks to hedge an option position.

    We have Call option with the following characteristics:

    X = 50; T=1 year; standard deviation = 20%; T-bill rate = 3%.

    Hedge ratio = N (d1) from the Black-Scholes equation

    For S=$45, d1 = - 0.0268 and N (d1) = 0.489309.

    For S = $50, d1 = 0.5 and N (d1) = 0.6915.

    If S = $55, d1 = 0.97655 and N (d1) = 0.8356.

    From the above values obtained, it means that the price of the call option becomes more sensitive to changes in the price of the stock at higher stock prices.
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