KEY POINTS

Investors thinking they can find both safety and yield in Treasurys are making a dangerous bet that could begin to unravel soon, especially if the Federal Reserve switches from its easing programs to an updated version of "Operation Twist."

Treasury Building

The "Twist" term refers to early 1960s-era operations wherein the central bank sold shorter-dated securities and bought longer-dated ones, in an effort to drive down long-term rates and spur economic growth. Some investors are anticipating that's what FedChairman Ben Bernanke will indicate in his speech from Jackson Hole, Wyo., on Friday.