When do higher bond yields become a bigger problem for stocks?

Rising bond yields are gaining more attention from investors due to a global bond selloff and the need to reassess economic absorption capacity without harming growth. The key factor for stocks is not just the high yields themselves, but why they are rising and how quickly. Benchmark government bond yields have increased across major markets, with the U.S. 10-year Treasury yield reaching around 4.81% and the 2-year yield climbing to 4.42%. These increases have raised expectations of a September Federal Reserve rate hike.

Bond yields influence the return investors expect from riskier assets. When yields rise, stocks must offer a higher potential return to remain attractive compared to government debt. This also affects the valuation of companies' future profits, typically putting more pressure on expensive, high-growth shares. Higher yields can also raise borrowing costs, potentially slowing consumer spending and business investment for companies heavily reliant on debt or in need of frequent refinancing.

BCA Research notes that stocks have historically performed across different rate environments, depending on the cause of the yield increase. Strong growth can push both bond yields and equity prices higher, while inflation driving the increase tends to result in a negative relationship between yields and equities. Higher yields can be absorbed by equities, but sharp spikes may cause issues as investors anticipate tighter monetary policy.

Investors should examine the speed of yield movements, their underlying reasons, and earnings expectations. A gradual increase in yields due to improving growth might be manageable, while a sudden rise caused by entrenched inflation expectations, fiscal concerns, or doubts about central bank credibility poses a more significant threat to stock valuations.