Question 6.4: Suppose that the risk-free rate is 8%. However, as a small i...

Suppose that the risk-free rate is 8%. However, as a small investor, you can invest money at 7% only and borrow at 10%. Does either of the strategies in the proof of Proposition 6.2 give an arbitrage profit if F(0, 1) = 89 and S(0) = 83 dollars, and a $2 dividend is paid in the middle of the year, that is, at time 1/2?

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No arbitrage profit can be realised in these circumstances. Though the theoretical no-arbitrage forward price is about $87.83, the first strategy in the proof of Proposition 6.2 brings a loss of 89−83e^{10\%} +2e^{0.5×7\%} ≅ −0.66 dollars and the second one results in a loss of −89 + 83e^{7\%} − 2e^{0.5×10\%} ≅−2.08 dollars.

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