Core argument: Japan’s artificially suppressed long-term yields mask unsustainable debt levels and will continue driving currency weakness.
The left chart shows monthly data for 30-year government bond yields. The right chart shows the corresponding 30-year yield differentials. A couple of points are worth making. First, the UK has the highest differential, so has the biggest problem. What’s interesting is that its differential jumped during the LDI blow-up in 2022 and never normalized. A permanent risk premium has been priced in and is gradually growing. Second, as much as Japan’s differential has risen, it remains negative and far below most other countries. This - in a nutshell - is why the Yen is so weak and in my opinion will keep falling. Japan’s long-term yields are still far below where they should be given the monstrous level of public debt. Third, without ECB yield caps with things like the Transmission Protection Instrument (TPI) and verbal as well as actual intervention, much of the Euro periphery plus France would have long-term yields in the double digits. I’m glossing over that here, but the reality is that - without the ECB - much of the Euro zone would be in severe crisis.Which Countries Are Out Of Fiscal Space?
AI Summary. Countries with long-term government bond yields significantly above their trade-weighted peers signal exhausted fiscal space, with the United Kingdom carrying the largest risk premium and Japan the smallest despite high public debt levels.
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Brooks argues the 30-year trade-weighted differential of several advanced economies suggests, “Japan is in trouble, as is the UK and much of the Euro periphery…The US is the cleanest shirt in the hamper.”
Takeaways by Macro Roundup® AI
- Japan’s artificially suppressed long-term yields mask unsustainable debt levels and will continue driving currency weakness.
- Eurozone periphery countries depend entirely on central bank intervention to avoid double-digit borrowing costs and financial crisis.


