Junk-Bond Yields Post Biggest Weekly Jump in Three Years

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Junk-rated companies had the biggest weekly jump in borrowing costs in more than three years as the plunge in oil prices roiled corporate-debt markets.

The average yield on speculative-grade bonds surged 0.47 percentage point this week to 7.2 percent, the largest increase since it rose 0.48 percentage point in the period ended Sept. 30, 2011, Bank of America Merrill Lynch index data show.