Let (R, P) be the value of a European receiver, payer swaption with the same expiry, swap

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Let \(R, P\) be the value of a European receiver, payer swaption with the same expiry, swap term, and strike \(K\).

(a) Let \(S\) be the value to the receiver of the underlying swap with fixed rate \(K\). Prove put-call parity for European-style swaptions: \(R-P=S\).

(b) Using Table 7.3, calculate the value to the fixed-rate receiver of a \$1M 1 year into 2-year forward swap with semiannual fixed rate of \(4 \%\) per annum.

(c) Using the results of Example 3, show that put-call parity holds.

Table 7.3

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