# BD_SM_c21 - Chapter 21 Option Valuation 21-1. Construct the...

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Chapter 21 Option Valuation 21-1. Construct the call out of the stroke and bond 30s 100b 5 20s 100b 0 += Substituting these two equations leads to: 10s 5 1 s 2 = = So, 11 20 100b 0 and b 21 0 = So the value of the option today is: 0 0 1 25 \$3.066 . 0 6 1 0 ⎛⎞ ⎛ ⎞ −= ⎜⎟ ⎜ ⎟ ⎝⎠ ⎝ ⎠

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166 Berk/DeMarzo Corporate Finance 21-2. Construct the put out of the stock and bond: 30 1.06B 0 20 1.06B 5 ∆+ = = Substituting these into the equations: 10 5 1/2 −∆ = ∆=− So, 20( 1/ 2) 1.06B 5 B 14.1509 −+ = = So the price of the option is 25(–1/2) + 14.1509=\$1.65. 21-3. Up state at time 1: 11s 100b 4 6.5s 100b 0 += So, 4.5s 4 4 s0 . 8 8 8 9 4.5 6.50 0.8889 b 0.05778 100 = == × =− = So the value of the option in this date is: 100 8.50s b \$1.946 1.03
Chapter 21 Option Valuation 167 In the down state at time 1 the option is worth nothing so at time 0 we have the following tree: 8.50s 100b 1.946 4s 100b 0 += () 4.50s 1.946 s 0.4325 4 0.4325 b 0.017298 100 = = =− So the price of the call is: 100 0.017298 60 .43 25 1.03 = \$0.9153 21-4. Up state at time 1: 11 1.03B 0 6.50 1.03B 0.50 So, 4.50 0.50 0.5 0.1111 4.5 0.5 6.5 0.1111 B 1.1866 1.03 So the price is 8.5 0.1111 1.1866 \$0.2422 ∆+ = = −∆ = ∆= −× == ×− + = Down state at time 1: 6.5 1.03B 0.5 21 . 0 3 B 5 So, 4.50 0.5 5 4.5 1 4.5 52 1 B 6.7961 1.03 So the price is 4 1 6.7961 \$2.7961 = = ×− + = Time 0:

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168 Berk/DeMarzo Corporate Finance 8.5 1.03B 0.2422 4 1.03B 2.7961 4.50 0.2422 2.7961 0.5675 2.7961 4 0.5675 B4 . 9 1 8 7 1.03 So the price of the call is 6 0.5675 4.9187 \$1.51 ∆+ = = −∆ + = ∆=− −× == ×− + = 21-5. In example 2.1.1, the theoretical put price is \$7.78. If it actually sells for \$8, it is overvalued sell it and buy the replicating portfolio. This means that at t = 0, you will: sell \$8 put, short 0.6 units of stock, and lend \$40.7767. Following this strategy, you will end up with \$0.22. At maturity, the payoff of the option and the value of the replicating portfolio cancel out. 21-6. In example 2.1.1, the theoretical put price is \$4.85. If it actually sells for \$5, it is overpriced sell it and buy the replicating portfolio. This means that at t = 0, you will: sell \$5 put, short 0.5322 units of stock, and lend \$31.0114.
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## BD_SM_c21 - Chapter 21 Option Valuation 21-1. Construct the...

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