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Square Mile Research: When the Curves go Topsy Turvey

Investment news for Financial advisers and Paraplanners

9 Sep 2019

Square Mile Research: When the Curves go Topsy Turvey

When I started out in this industry (and frankly for many years after then), I used to get very confused about yield curves, particularly when they get inverted. Thankfully, I now realise that it's quite simple. 

The yield curve graphically describes what the interest rate is at various time points. So starting with bonds very close to maturity such as the 3 month gilt (or treasury bill), we can find an effective rate for a short term investment. As we extend the maturity rate, we can find the rates for 1yr, 2yr, 3yr etc bonds. Typically, curves go out as far as 30 years. 

Under 'normal' conditions, investors will receive a higher interest rate for investing over lengthier time periods. Intuitively, it is reasonable to expect to receive a higher return if you are prepared to lock up your cash for longer periods. Yields rise as you go along the maturity range and this is a 'normal' yield curve. 

These normal conditions are helpful for financial businesses such as banks, which tend to take short term deposits from savers and provide longer term loans to borrowers. 

An 'inverted yield curve' occurs when bonds close to maturity begin to yield more than those with lengthier maturities. The implication is that short term interest rates are unusually high, say perhaps the central bank has lifted interest rates to snuff out inflationary pressures. A yield curve inversion is actually quite rare. 

In the US, the 3 month Treasury currently yields 1.9%, while the 10yr Treasury yields 1.5%. Markets have become more concerned about the sustainability of growth in the economy and the yield curve indicates that short term rates may have to be reduced to stimulate growth. 

The worry for investors is that over the last 60 years, an inversion in the US yield curve has presaged a recession, usually with a 12 to 18 month lag. The last time this occurred was in July 2007. In fact, this indicator has never given a false negative reading (if the inversion persists for at least 3 months). The current inversion occurred in March and is now clearly an increasing cause for concern.

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