30年日债这么跌，会把30年美债一起拖下水？

Core Viewpoint - The sharp rise in Japan's 30-year government bond yields signals potential structural issues in the global bond market, with Japan's situation possibly serving as a "canary in the coal mine" for broader market concerns [1][8]. Group 1: Japan's Bond Market Dynamics - Japan's 30-year government bond yields have surged to historical highs, now comparable to Germany's, raising alarms about the global bond market [1]. - Morgan Stanley warns of a "value trap" in Japanese bonds, where seemingly cheap bonds may continue to depreciate due to structural supply-demand imbalances [3][7]. - Since early April, the 30-year Japanese bond yield has increased by 85 basis points, outpacing the 60 basis point rise in U.S. bonds during the same period [3]. Group 2: Global Bond Market Implications - High inflation pressures, declining demand from asset-liability management (ALM) investors, and high government financing needs are identified as three global trends affecting bond markets [9]. - Japan's core inflation rate has exceeded the Bank of Japan's 2% target for two consecutive years, contributing to rising equilibrium yields [9]. - The ongoing high fiscal deficits in developed markets are expected to keep debt issuance levels elevated, further pressuring long-term bonds [9]. Group 3: U.S. Bond Market Concerns - The rise in Japanese bond yields is expected to influence U.S. Treasury yields, potentially steepening the yield curve [2][11]. - Morgan Stanley indicates that the risk-reward ratio for long-term U.S. bonds is less favorable compared to short-term bonds, with a significant disparity in risk-adjusted returns [11]. - The attractiveness of hedged Japanese bonds may lead to a reallocation of investment portfolios, putting additional downward pressure on the U.S. long-term bond market [11]. Group 4: Potential Responses from the Bank of Japan - The Bank of Japan's future policy direction is under scrutiny, with potential measures including adjusting the duration of issued debt and maintaining a steady pace of quantitative tightening [13]. - A gradual return to interest rate hikes is anticipated, with expectations for the next rate increase in January 2026, which could flatten the yield curve and manage long-end risk premiums [13].