Japanese government bonds traded at a negative yield for the first time ever on Friday, thanks to the Bank of Japan's massive asset-purchase scheme as it seeks to stoke inflation and revive an economy that slipped into recession in the third-quarter. The BOJ's task got even stiffer this week as a plunge in oil prices threaten its 2 percent price goal, meaning the central bank could be forced to expand its stimulus further, soaking up more debt paper and spreading negative yields to longer-dated maturities. The two-year JGBs traded at the yield of minus 0.005 percent. Negative yield is an unusual, but not uncommon ... (full story)