Core Viewpoint - Goldman Sachs analysts indicate that the surge in Japanese bond yields is primarily due to a deterioration in supply-demand balance, which has become more pronounced and is unlikely to ease in the short term [1] Group 1 - The increase in Japanese bond yields is attributed to changes in demand from life insurance companies and a narrowing duration gap [1] - The supply-demand imbalance is expected to persist in the near future, indicating ongoing pressure on bond yields [1]