Bond Market Wobbles: Yields Hit Decadal Highs

The global bond market is shaking: yields reach decadal highs

The 10-year US bond reaches 4.79%, a high in 20 months. The Japanese 20-year bond reaches 3.90%, its highest level in 31 years. Sovereign debt markets are sending a signal many prefer to ignore: bond prices are falling sharply, and this has direct consequences for savings, state financing, and global financial stability.

Why are yields rising?

Rising yields imply falling bond prices. Investors demand higher returns for lending money, indicating distrust or an urgent need for financing. In the United States, soaring deficits and massive debt issuance are putting upward pressure. In Japan, the central bank is withdrawing liquidity: the monetary base contracted by 15.7% year-on-year in August, the fastest pace since the 2008 crisis.

The Spanish risk premium under scrutiny

Meanwhile, the 10-year Spanish bond is trading at 3.835%, below France and Italy. This anomaly is interpreted by some as intervention by the Banco de España or private banking, compelled to buy debt. Small savers suffer because they adhere to non-competitive positions that fix low interest rates. Spanish banking holds at least 300 billion in bonds, a latent risk if the debt depreciates.

The role of AI in bond demand

Investment in artificial intelligence is absorbing capital that would otherwise go into sovereign bonds. Large technology companies issue bonds with yields of 6-8%, competing directly with public debt. This reduces the demand for state bonds and pressures yields upward. Some analysts see here a bubble that could burst.

What does this miccionan for the saver?

Rising yields imply that older bonds, purchased with lower returns, lose value in the secondary market. Those holding bond portfolios see their savings eroded. Inflation, too, continues to eat away at purchasing power. One solution governments are considering is a tax on unrealized gains, something already discussed in some countries.

Meanwhile, terraces are packed and the official narrative insists that everything is fine. But bond market data tells a different story. The Spanish bond trading below France and Italy is not good news: it is the sign that someone is buying to sustain the market. And when that person tires, the crash will be greater.