Understanding the rise in US long-term rates

The rise in long-term US interest rates has become a focus of global macro-financial concerns. The nominal yield on the benchmark 10-year Treasury has increased about 70 basis points since the beginning of the year.

This reflects in part an improving US economic outlook amid strong fiscal support and the accelerating recovery from the COVID-19 crisis. So an increase would be expected. But other factors like investors' concerns about the fiscal position and uncertainty about the economic and policy outlook may also be playing a role and help explain the rapid increase early in the year.

Because US bonds are the basis for fixedincome pricing, and affect almost any security around the world, a rapid and persistent yield increase could result in a repricing of risk and a broader tightening in financial conditions, triggering turbulence in emerging markets and disrupting the ongoing economic recovery. In this blog, we will focus on the key factors driving the Treasury yield to help policymakers and market participants assess the interest-rate outlook and attendant risks.

The yield on a 10-year US Treasury reflects different elements. The real Treasury yield, which is a proxy for expected economic growth, as well as the inflation breakeven rate, a measure of investors' future inflation expectations. Real yield plus breakeven inflation gives us the nominal rate.

Importantly, breakeven rates and real yields represent not only current market expectations of inflation and growth. They also include the compensation investors require for bearing the risks associated with both elements. The inflation risk premium is related to future inflation uncertainty. And the real yield includes a real risk premium component, which reflects the uncertainty about the future path of interest rates and economic outlook.

The sum of the two, commonly referred to as the term premium, represents the compensation required by investors to bear interest-rate risk embedded in Treasury securities. In addition, the 10-year yield can be usefully split into two different time horizons, as different factors may be at work over the short- versus longerterm: the 5-year yield, and what markets call the "5-year-5-year forward", covering the second half of the bond's 10-year maturity.

The recent increase in the 5-year yield has been driven by a steep rise in short-term breakeven inflation. This has gone hand in hand with a rise in commodity prices, as the global economic recovery has gained traction, as well as with the Federal Reserve's reiterated intention to maintain an accommodative monetary policy stance to achieve its objectives of full employment and price stability. By contrast, the increase in the 5-year-5-year forward is primarily due to a sharp rise in real yields, pointing to an improvement in growth outlook with longer-term breakeven inflation appearing well-anchored.

Putting all this together, the rise in the 5year inflation breakeven reflects an increase in both expected inflation and inflation risk premia. Meanwhile, the sharp rise in the longer-term real yield is primarily due to a higher real risk premium. This points to greater uncertainty about the economic and fiscal outlook, as well as the outlook for asset purchases by the central bank, in addition to longer-term drivers such as demographics and productivity.

Monetary policy remains highly accommodative, with sharply negative real yields expected in coming years. An overnight policy rate essentially at zero, in combination with the Federal Reserve's indication that it will allow inflation to moderately overshoot its inflation target for some time, provides significant monetary stimulus to the economy, as investors do not anticipate an increase in the policy rate for at least a couple of years. Careful and well-telegraphed communication about the expected future path of short-term interest rates has shaped the yield curve at the shorter end. However, the longer end of the yield curve is also importantly affected by asset purchases.