Why are long-term Japanese government bond yields rising sharply?
Core argument: The 40-year Japanese government bond yields nearly 3.7%, up a full percentage point since the beginning of April, and Japan's credit rating sits three notches below the US even after the recent US downgrade.
The 40-year Japanese bond now yields nearly 3.7%, up a full percentage point just since the beginning of April. Japan’s fiscal problems are well known, of course. The country has had a massive debt burden for many years. Its credit rating is three notches below the US even after the recent US downgrade. None of this is new. But several things have changed recently. First is inflation. Second, Japanese insurers have virtually stopped purchasing very long-term bonds, to satisfy new economic solvency ratios introduced recently. Third, long-term fiscal concerns are rising. Perhaps the most important change is from the Bank of Japan. The central bank still owns a staggering 50 per cent-plus of the Japanese government bond market. But with deflation now in the rear view, the BoJ has started quantitative tightening. And as this one massive buyer has become a net seller, Japanese bond yields are normalising — aka rising. [Strangely], the 40-year JGB now yields over 4.6% — almost 1% more than the “on-the-run” 40-year JGB simply because it is less liquid and “off-the-run.” That kind of glitchy pricing is [further] evidence of the evaporating demand for longer-term Japanese debt.


