"The theory first: when pricing the coupon with a floor, you can't just take the expected LIBOR rate from your forecast curve and take the minimum between that and the floor. Instead, you need to take the expected value of the minimum between the rate and the floor, and unfortunately E[min(R,F)] is not the same as min(E[R],F). So no, the floor doesn't just provide a minimum; you need a different formula to estimate the expected payoff."
Thanks
Anthony
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