- 6.3. It was crucial for our no arbitrage computations that there were only two possible...
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- 6.3. It was crucial for our no arbitrage computations that there were only two possible values of the stock. Suppose that a stock is now at 100, but in one month may be at 130, 110, or 80 in outcomes that we call 1, 2, and 3. (a) Find all the (nonnegative) probabilities P₁, P2, and p3 1 - P₁ – P₂ that make the P1 P2 stock price a martingale. (b) Find the maximum and minimum values, v₁ and vo, of the expected value of the call option (S₁ - 105)+ among the martingale probabilities. (c) Show that we can start with v₁ in cash, buy x₁ shares of stock and we have v₁ + x₁ (S₁ − So) ≥ (S₁ − 105)+ in all three outcomes with equality for 1 and 3. (d) If we start with vo in cash, buy xo shares of stock and we have vo + xo(S1 − So) ≤ (S₁ − 105)† in all three outcomes with equality for 2 and 3. (e) Use (c) and (d) to argue that the only prices for the option consistent with absence of arbitrage are those in [vo, v₁]. = - 6.3. It was crucial for our no arbitrage computations that there were only two possible values of the stock. Suppose that a stock is now at 100, but in one month may be at 130, 110, or 80 in outcomes that we call 1, 2, and 3. (a) Find all the (nonnegative) probabilities P₁, P2, and p3 1 - P₁ – P₂ that make the P1 P2 stock price a martingale. (b) Find the maximum and minimum values, v₁ and vo, of the expected value of the call option (S₁ - 105)+ among the martingale probabilities. (c) Show that we can start with v₁ in cash, buy x₁ shares of stock and we have v₁ + x₁ (S₁ − So) ≥ (S₁ − 105)+ in all three outcomes with equality for 1 and 3. (d) If we start with vo in cash, buy xo shares of stock and we have vo + xo(S1 − So) ≤ (S₁ − 105)† in all three outcomes with equality for 2 and 3. (e) Use (c) and (d) to argue that the only prices for the option consistent with absence of arbitrage are those in [vo, v₁]. =
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SOLUTION a We need to find probabilities p1 p2 and p3 such that the stock price is a martingale ie the expected value of the stock price at time 1 is equal to the current stock price 100 130p1 110p2 8... View the full answer
Related Book For
Smith and Roberson Business Law
ISBN: 978-0538473637
15th Edition
Authors: Richard A. Mann, Barry S. Roberts
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