the 10-treaure or 30-treasure rate could be zero? I know this situation can happen frequently between friends and relatives. I remeber I borrowed 20k chinese yen from my brother with zero interest and no repayment term when I first time came to u.s. after many years, about 10yrs, I returned the loan exactly the same amount when I visited china. so this possiblity is there, if that does happen, what will be worthing of ZN/ZB futures? this sounds crazy.under what kind of scienrio, this will happen, after another big big never seen crisis? why I have this crazy idea, I found in the stock market: the market 70% time is going up, 30%time is going down(bad things happen, but quickly be fixed), so normally I rearely short, I always buy, if meets adversary, I just hold, and keep telling myself: bad things are always temporary, the world is not ending here. that works pretty well.