JGB Yields Approach 30-Year Highs as SocGen Warns of Global Valuation Shock
nashnova research
Japan's 10-year government bond yield hit 2.88%, the highest since 1996. SocGen strategist Albert Edwards warns that if cheap Japanese capital retreats, US equities trading above 20× forward P/E may not hold.
How far have Japanese bond yields risen?
The 10-year JGB yield climbed to 2.88% on Thursday — its highest since September 1996 — marking nine straight days of gains, the longest streak in nearly two decades.
The 20-year yield surged to multi-decade highs in tandem. Ultra-long JGB yields now exceed Germany's and approach Spain's.
This means → the world's last "ultra-low-rate fortress" is being forcibly repriced by the market.
Why is the yield curve flashing an abnormal signal?
The spread between 10-year and 2-year JGBs widened to 143 basis points, the widest since 2004. In plain terms = long-dated bonds are selling off hard while short-dated bonds barely move — the two ends are diverging sharply.
Daiwa Securities senior economist Kento Minami called the steepening "an alarm bell from investors," pointing to a clear disconnect between risk as the market prices it and the government's fiscal and monetary stance.
Mitsubishi UFJ Asset Management's Masayuki Koguchi noted that relative to current inflation, the 10-year yield is still too low — and must rise further as prices climb.
Demand at last week's 10-year JGB auction fell to the lowest since April. Even at multi-decade highs, buyers have not returned.
How did fiscal expansion plans light the fuse?
PM Shigeru Takaichi's government disclosed plans for over ¥370 trillion in combined public-private investment through FY2040, while floating a cut in the food consumption tax to 1% — with no clear funding source.
Mizuho Securities analysts noted that markets now see the Takaichi administration as treating easy monetary policy as a prerequisite for growth — and therefore "unlikely to welcome" rate hikes. This means → political pressure has sharply narrowed the BOJ's room to tighten.
The yen is already casting a vote of no confidence: JGB yields are surging, yet the yen keeps weakening — defying textbook economics. Sources say the government is already considering revising the wording of its economic blueprint to calm the bond selloff.
Why does Edwards call this a global risk?
He compared the current Japanese market disruption to the 2022 UK "mini-budget" crisis under Liz Truss, arguing a financial storm capable of hitting global asset valuations may be brewing.
The core logic: for decades, Japan's suppressed bond yields and excess QE liquidity provided a massive tailwind for global equity and bond valuations. In plain terms = Japan has been the world's biggest cheap-capital tap, and that tap is now closing.
He posed a direct question: if the 10-year JGB yield keeps climbing toward 4%, can US equities sustain a forward P/E above 20×? His answer: "I don't think they can."
What links the AI investment boom to the retreat of cheap capital?
Edwards cited a recent Bank for International Settlements (BIS) warning: if the current AI investment boom under-delivers economically, it could become a "prolonged investment bust."
He drew parallels to the 1830s canal mania, 1840s railway expansion, and late-1990s internet bubble. This reflects his core fear — competitive capacity buildouts fed by cheap money have ended in collapse every single time in history.
This means → if Japan's cheap-capital retreat and a peaking AI investment cycle coincide, the combined shock would far exceed either event alone.
What is the market watching next?
The BOJ raised its short-term policy rate to 1% in mid-June. Swap markets imply an 87% probability of another 25-basis-point hike by December.
The market's verdict, however, is that this pace is far too slow given returning inflation and fiscal expansion impulses.
In plain terms = whether JGB yields can stabilize at current levels is the key test of global investor confidence in Japan. If they cannot, Edwards's warning moves from commentary to reality.
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