Recent declines in US government bond yields have led to a flood of articles discussing the likelihood of a US recession over the next 12-18 months. This is understandable, first given the relatively strong correlation between yield curve inversions and US recessions in the past and second, the extraordinary length of the current US economic expansion. However, we believe recent correlation-focused commentary misses a key point in terms of causation. There are in our view good reasons to believe that the recession signal from the flat US yield curve is a false positive.
A yield curve inversion is where short-term interest rates are higher than long-term rates. This situation can occur for a number of real-world reasons, even if it may appear counter-intuitive in a simplified economic model. In prior US economic cycles the yield curve has inverted as the US Fed rapidly increased short-term interest rates with the intention of slowing the US economy in order to ease inflationary pressure.
It should not be a surprise therefore, assuming monetary policy has any effectiveness, that following a period of tighter monetary policy the data shows the US economy slowed. This is the growth/inflation trade-off which was the policy dilemma of prior cycles, also in our view largely responsible for the observed correlation between yield curve slope and future economic activity. However, this historical growth/inflation trade-off is qualitatively different from the challenges facing monetary policymakers today.