Quote from Martinghoul:
Ah, yes, I see... Well, there's a bit of a problem trying to imply a probability distribution out of those. The zero bound sorta f*cks everything up (referring to swaptions, which is the only mkt that exists that far out).
I know Merrill Lynch made a market in this stuff a few years back for even smallish BDSs such as myself. I nearly pulled the trigger on a 5 or 10 year put swaption on the 10-year yield in winter 2008 when it briefly yielded below 2% (stupid, the damn thing doubled within months). Vols were so low at that point, the trade would have probably been profitable even if rates hadn't gone up. It was about as risk-free as you could get.