Interest Rate (LIBOR) goes up ---> (Fixed rate) Payer Swaption gains in value, because paying fixed rate and receiving floating rate.
---> Bond price goes down
Interest Rate (LIBOR) goes down ---> (Fixed rate)Payer Swaption value = 0, because he will only lose the price paid on the option premium.
---> Bond price goes up
Therefore, it's same as call option on interest rate (= put option on bond price).
[此贴子已经被作者于2009-6-3 23:02:06编辑过]