Charts to Watch as Stocks Fall:iShares 20+ Year Treasury Bond (TLT) The proximate cause for the selloff was Friday's stronger-than-expected jobs report. But the real catalyst was the resulting rise in long-term interest rates - and weakness in long-term Treasury bond prices, as shown by the iShares Barclays 20+ Yr Treas.Bond (ETF) (NASDAQ: TLT ) above - as investors pushed up inflation expectations. A reprieve in the TLT selloff will give investors time to calm down.