Curve Ball – Is The Yield Curve Still A Dependable Signal? by 720Global
Over the last 30 years, there has been a widely held belief, supported by data, in the predictive powers of the “slope” of the yield curve. The slope of the yield curve is a simple calculation comparing interest rates of various maturity terms. Traditionally, the slope of the yield curve is measured by the difference between interest rates of shorter term government debt, such as the 3-month Treasury Bills or 2-year Treasury Notes, and long-term government debt such as 10-year Treasury Notes and 30-year Treasury Bonds. A steep yield curve, where long term government yields are significantly higher than short ones, implies economic expansion in months and quarters ahead. A flat or inverted yield curve, where long term government yields are not much higher or are even lower than short term ones, implies economic weakness and heightened recession risks ahead.
The past is not always prologue for the future so we ask the following question: Do the normal rules apply when the Federal Reserve (Fed) has lowered the Federal Funds rate to unprecedented levels for over 7 years and quadrupled the money supply? Questioning the value of traditional analysis is not only appropriate, it is necessary, if one is to effectively perform economic analysis given the unique nature of central bank actions.
Traditional Yield Curve Analysis
Below we graphically represent the slope of the yield curve and recessionary periods to demonstrate the predictive relationship. The first chart plots the yield on 2-year Treasury notes and the yield on 10-year Treasury notes. The subsequent chart shows the difference between 2-year Treasury Note yields and 10-year Treasury Note yields, otherwise known as the “2’s-10’s curve”. To highlight the predictive nature of the yield curve, periods where the curve was inverted are plotted in red and recessions are highlighted with yellow bars.
The simple deduction from the second chart is that when the yield curve, as measured by the 2’s-10’s curve, has inverted the U.S. economy entered a recession within a relatively short period of time.
Based solely upon the precedent of the last 30-years and the slope of the curve today (1.42%), one might conclude that there is relatively little reason to worry about a pending U.S. recession. In fact, current levels are similar to those when recession typically ended and prolonged periods of economic growth began.
As proposed in the introduction, Fed monetary policy is far from normal. Investors therefore need to understand that the unprecedented nature of Fed policy and the fact that the Fed Funds rate has been pegged at zero since December 2008 likely plays a larger part in influencing the shape of the curve than in times past. This unprecedented posture by the Fed is distorting not only the price of money through interest rates but also economic activity. Shorter maturity instruments such as the 2-year Treasury note are heavily swayed by the monetary policy stance established by the Fed while longer maturity instruments such as the 10-year Treasury tend to be largely driven by the rate of inflation and economic activity. By keeping short rates artificially low through a zero Fed Funds target rate policy, the Fed is heavily influencing short-term interest rates and causing the yield curve to be artificially steep. One way to test this theory is to use the Taylor Rule as an alternative Fed Funds target guide.
The Taylor Rule
The Taylor Rule, proposed by Stanford economist John Taylor in 1993, sets forth a prescriptive policy benchmark for the Fed Funds target rate based upon the state of the economy using the rate of inflation and actual economic growth relative to potential growth. This formula not only suggests what Fed interest rate policy should be but also serves as a useful measure of the aggressiveness of prior Fed policy.
Currently, the Taylor rule suggests that the Fed Funds target rate should be approximately 2.85%. With current 2-year Treasury yields at 0.60% and 10-year Treasury yields at 2.02%, the 2’s-10’s curve is 1.42%. If the Fed were to follow the Taylor Rule and the Fed Funds rate were reset accordingly, the yield curve would become significantly inverted, with the assumption that 2-year yields rise pro-rata with Fed Funds as is typical. In fact, the yield curve would be more inverted than at any time in the last 30 years and signaling an imminent recession. The chart below compares the current 2’s-10’s curve versus a Taylor Rule-inspired curve.
Net Interest Margin
Another yield curve derived tool used to assess the economic outlook is the state of financial institutions’, predominately banks, net interest margins (NIM). Banks generate a substantial portion of their income from the difference between the yield at which they borrow and the yield at which they lend. The inputs to NIM from a financial statement perspective are interest income minus interest expense. Historically, when the yield curve flattens, the ability of banks to generate income is challenged because the rate at which banks borrow converges towards the yield earned on loans and investments (NIM declines). When NIMs contract, banks tend to engage in less lending activity, constricting economic growth and adding further pressure on the slope of the yield curve to flatten. This self-reinforcing cycle is usually broken when the Fed lowers the Fed Funds rate, which tends to steepen the yield curve and increase NIMs. The chart below compares the relationship of the traditional 2’s-10’s curve and NIM. The red circles emphasize periods where the yield curve was inverted, which ultimately led to recessions.
Clearly a strong correlation exists between the slope of the yield curve and NIM. The chart also reflects that although the 2’s-10’s curve remains steep today, banks NIMs have declined to their lowest levels in over 30 years and are below those associated with an inverted yield curve preceding U.S. recessions.
In the world of a zero interest rate policy, NIM may be a more valid indicator of future economic activity. In other words, economic forecasts based on the shape of the traditional curve may not be as relevant given the unprecedented monetary policy actions of the Fed. Very low levels of interest rates are squeezing bank profits which is one of the key drivers of lending activity and a primary determinant of economic activity. Growth of the U.S. economy, even at today’s below trend pace, is more dependent than ever on a continuation of credit growth. If bank lending activity is challenged as a result of declining NIM, it would stand to reason that NIM may serve as a useful indicator of potential economic weakness. The graph below serves as a reminder of what happened the only time credit growth declined in the last 65 years – the U.S. experienced the largest financial crisis since the Great Depression.
Conclusion – Debt Drives Growth
Economic growth for the last 30 years has been increasingly funded by debt. For this scheme to continue, there