Société Générale warns that rising Japanese government bond (JGB) yields, described as the "worst since 1987," may signal the end of the post-2008 favorable investment environment. The unwinding of Japanese yen-funded carry trades, historically used to suppress global yields and support markets like U.S. Treasuries, could trigger a significant sell-off in U.S. financial assets as Japanese investors repatriate capital, further exacerbated by America's fiscal vulnerabilities. With Japanese core CPI inflation exceeding that of the U.S. and Eurozone, pressure mounts on the Bank of Japan to tighten monetary policy, potentially accelerating the shift.
Société Générale's chief global strategist, Albert Edwards, has issued a stark warning regarding the potential for Japan's bond market turmoil to trigger a significant global financial market shift, potentially ending the favorable investment climate prevalent since the 2008 Global Financial Crisis. This concern is rooted in the 'explosive rise' of Japanese long-term government bond (JGB) yields, highlighted by a recent 20-year JGB auction described by market observers as 'the worst since 1987,' where, according to EndGame Macro, bids collapsed and yields spiked, turning 'cracks in global bond markets...into fractures' and suggesting a potential 'first sovereign domino tipping over.' The analysis from Société Générale posits that Japan, historically a 'keystone' for global yield suppression through yen-funded carry trades and substantial foreign bond purchases, particularly U.S. Treasuries, is witnessing the end of this era. This transition is attributed to capital repatriation to Japan as the Bank of Japan (BoJ) reportedly loses control of its long-end yield curve and FX-hedged returns on U.S. Treasuries become deeply negative. The unwinding of these extensive carry trades could precipitate a 'loud sucking sound' with significant withdrawal of capital from U.S. financial assets, including vulnerable U.S. Treasury markets (GOVI, US10Y, US2Y, US30Y) and equity markets (SP500, DJI, COMP:IND), which have been inflated by these flows. Compounding this risk is the U.S.'s precarious fiscal situation, labeled by Edwards as a 'ticking fiscal time-bomb.' Furthermore, Japanese core CPI inflation now reportedly exceeds that of the U.S. and Eurozone, intensifying pressure on the BoJ to tighten monetary policy, potentially through rate hikes and balance sheet reduction, which could further accelerate JGB yield increases and exacerbate capital outflows from global markets, as even moderate BoJ quantitative easing tapering is already creating significant JGB demand gaps.
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