On July 31, the U.S. Treasury, acting through the Federal Reserve Bank of New York, intervened directly in the foreign-exchange market to support the yen by selling euros and buying yen.
Today, the yield on Japan’s 10-year government bond has risen to roughly 3.1%, while the yield on the U.S. 10-year Treasury has climbed to around 5.2%.
In the simplest terms, rising yields mean:
Bond prices are falling, and investors are demanding higher returns to keep holding them.
A key reason Washington stepped in to support the yen in late July was concern that Japan, in trying to rescue its currency, might be forced to sell large quantities of U.S. Treasuries, convert the proceeds into dollars, and then use those dollars to buy yen.
That would have placed additional downward pressure on the U.S. Treasury market and pushed yields even higher.
The current situation is that this pressure has not disappeared. It has broadened into a global sell-off in long-duration government bonds.
In Japan, rising yields mean higher financing costs for the government and a higher risk premium demanded by markets over Japan’s fiscal position, inflation, central-bank policy and debt sustainability.
The same basic mechanism is now visible in the United States.
A 10-year Treasury yield around 5.2% means investors are demanding more compensation to hold U.S. government debt, amid inflation concerns, massive bond issuance, fiscal deficits, war risk and higher energy prices.
So the bond-market picture now looks like this:
Japanese government bond yields are rising.
U.S. Treasury yields are also rising.
The causes are not identical, but the pressures can reinforce one another.
Japan’s situation is especially difficult because the rise in yields is not being driven by an economy that is simply “too strong.”
Japan is dealing with a weak yen, inflation, fiscal expansion, enormous public debt and growing pressure on the Bank of Japan to normalize monetary policy faster.
With government debt still above 200% of GDP, higher interest rates translate directly into a heavier debt-servicing burden.
Even more awkwardly, the Japanese economy itself is not strong enough to absorb high interest rates comfortably.
The yen remains weak, domestic demand is fragile, and real purchasing power remains under pressure.
Japan is therefore trapped between two bad choices:
No rate hike → the yen remains weak and imported inflation continues.
Rate hike → bond yields rise, government financing costs increase, and the economy comes under greater pressure.
The United States is facing its own version of the problem.
Treasury yields are being pushed higher by inflation expectations, energy prices, large fiscal deficits, federal debt above $40 trillion, and expectations of continued heavy issuance.
So this is not a story of:
“Japan finally normalizes policy and America benefits.”
It is closer to this:
Japan is being forced out of the ultra-low-rate era.
America is being forced to pay more for its own fiscal excesses.
And that creates another problem for Washington.
As Japanese yields rise, Japanese investors have more reason to keep capital at home rather than buy U.S. Treasuries.
That weakens one source of demand for American debt.
In short:
Japan’s economy is weak, yet it is being forced to bear higher interest rates.
The U.S. economy is stronger, but its fiscal burden is so heavy that the bond market is demanding higher yields there too.
Rising yields in both countries do not necessarily signal strength.
Often, they signal the opposite:
the bond market is demanding a higher price from both governments for carrying their debt.
BREAKING: US government 10-year bond yield hits 5.17%, the highest since 2007.