Japan's Bond Market Shift Sparks Global Concern

The bond market is experiencing a significant shift in sentiment, and the source of this angst is being attributed to Japan. The traditional assumption that Japanese government bonds (JGBs) would remain pinned to the floor has been torn up, with JGB yields now above 3%. This change has significant implications for global markets.

The argument over the cause of this shift centers around whether it's due to a dismantling of the yen carry trade or an outright rates repricing. However, Goldman Sachs' analysis suggests that little evidence supports a fiscal funding panic as the main culprit. Instead, JGBs have outperformed swaps even as yields climbed, indicating supply absorption is not the primary issue.

The bigger shift, however, is structural. Japan's JGB yields are now competitive enough to attract its own savings, altering the math for other sovereign bonds like Treasuries and Bunds. This change could lead to a violent bond squeeze if growth cracks or disinflation returns.