Investors Face New Concerns as US Treasury Yields Approach 6%

LONDON, Sept 24 (Reuters) - The 5% mark on the benchmark US 10-year Treasury yield, once seen as a critical point triggering market turbulence, is now being reconsidered by investors. This month's brief rise above 5% has led to concerns that 6% could become the new threshold prompting anxiety among market participants.

Mike Bell, head of market strategy at BlueBay Asset Management, noted that while the recent increase above 5% is still untested, the figure is viewed more as a psychological indicator rather than an absolute limit. He stated, "People think of it as if there's a magic number for Treasury yields at which it becomes a problem, but it's a relative number, not an absolute number." What’s important is how Treasury yields relate to other investment measures, specifically the earnings yield on stocks.

This relationship is nearing a point of inflection, which could trigger a selloff in equity markets. Historical data shows significant downturns in the MSCI world stocks index when the 10-year Treasury yield previously breached 5%. Notably, the index lost half its value right before the global financial crisis and suffered another substantial decline around a nearly 6.8% spike during the dotcom bubble.

Analysts at JP Morgan suggest that the pain threshold for markets might now rest above 5% due to a "key structural shift" in the global economy. Sectors like AI, healthcare, and services are expanding despite rising borrowing costs, indicating that traditional interest-rate impacts may be less binding. The firm believes the breaking point for stock markets could be significantly higher, possibly between 5.5% and 6.0%.

In the $29 trillion Treasury market, a transition from 5% to 6% would represent a major shift in the global cost of capital. A 6% Treasury yield would suggest much higher inflation expectations, increasing worries over US fiscal sustainability, or a belief that interest rates will remain elevated for an extended period. Federal Reserve policymaker Austan Goolsbee remarked this week that he is unsure whether markets would respond differently to a prolonged period of 5% yields compared to historical instances.