As 5% Treasury yields lose shock value, investors start worrying about 6%

For years, a 5% benchmark on the U.S. 10-year Treasury yield was considered a point where global financial markets would start experiencing turbulence. However, this threshold appears to be evolving into a waypoint rather than a ceiling. This month, the 5% mark has been breached, prompting investors to ponder what might happen if the yield reaches 6%.

This has not yet been tested enough, but the 5% mark has always been a psychological marker rather than an automatic tripwire, according to BlueBay Asset Management's head of market strategy, Mike Bell. Bell explains that the significance lies in how Treasury yields compare to other key investment metrics, particularly the earnings yield on stocks.

The relationship between these metrics is now approaching an inflection point, potentially leading to an equity selloff. Historical data suggests this could be the case: the MSCI's main world stocks index lost half its value the last time the 10-year Treasury yield broke 5%, which occurred just before the global financial crash.

JP Morgan's analysts believe the pain-point might now be above 5% due to a structural shift in the global economy, with sectors like AI, healthcare, and services growing rapidly, regardless of borrowing costs. This means the traditional interest-rate channel is less binding, and the breaking threshold for stock markets may be higher, potentially in the 5.5%-6.0% range.

The $29-trillion Treasury market would experience a profound adjustment if yields shift from 5% to 6%. This could indicate higher inflation expectations, concerns about U.S. fiscal sustainability, or a belief that rates will remain elevated. Federal Reserve policymaker Austan Goolsbee said he doesn't know whether markets will react differently to a prolonged period of 5% yields compared to past reactions.

Invesco global head of asset allocation research, Paul Jackson, notes that investors focus on Treasury yields because they represent the world's risk-free benchmark. At yields above 5%, investors can lock in the highest returns on U.S. bonds since 2007. Jackson's calculations show that world stocks start to drop when the 10-year yield has averaged 4.72% for 12 months and then rises.

Currently, the 12-month average is around 4.34%, but Jackson is already reducing exposure to stocks and moving into government bonds to capitalize on the attractive yields. If yields continue to rise, there is a risk that the stock market could be lower a year from now. Emerging markets, which have enjoyed a recent hot streak, are often among the first to suffer when U.S. yields surge.

Higher Treasury returns strengthen the dollar and make dollar-denominated assets more attractive, pulling capital away from emerging market economies and potentially tipping them into crisis if servicing dollar-denominated debt becomes unmanageable. Recent data shows the largest exodus from emerging-market bond funds in months, with a notable decrease in equity fund investments as well.

Issuance of emerging-market sovereign debt has also been lighter than usual this month. While the situation is not yet dire, it raises concerns about the end of the era of abundant liquidity and ultra-cheap money, forcing global asset prices to adapt to a higher cost of capital.