In a world of negative interest rates, U.S. debt looks like a high-yielder. Hedge funds and other large speculators boosted their net long positions in Treasury Bond Futures as of May 24 to the highest level since 2005, a report from the Commodity Futures Trading Commission showed. Treasuries with maturities of 10 years and longer have returned 8.5 percent this year as inflation gauges remain below the Federal Reserve’s 2 percent target.

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