Why would anyone be prepared to do that? The simple answer
is that investors need the reliability and liquidity that high quality bonds
can provide when they have to allocate their portfolio over a wide range of
assets. Think of it this way: Even though investors would have maximised their
returns over the past decade if they had been fully invested in equities, at no
point could they ever be sure that the bandwagon would keep on rolling. Theory
suggests that long-term returns are maximised if the portfolio is spread across
a range of assets, and the likes of pension funds are required to allocate a
minimum portion of their portfolio to bonds in order to meet their payout
obligations. Even now pension fund providers will not hold less than 40% of their assets in bonds, and
although the returns may be miserable the buyers of high quality government
(and corporate) debt are highly likely to get their money back. The bond market
is thus a safe place to store wealth – a hedge in an uncertain world.
On the basis that demand for bonds is unlikely to dry up,
despite low interest rates, governments arguably have a strong incentive to
issue debt at current low rates, either to finance additional spending or
refinance existing debt. Moreover, they have an incentive to issue much longer
maturity debt than previously in order to lock in these rates for as long as
possible. One would think that no rational investor worth their salt would buy
bonds issued with a negative coupon rate. Think again. In August, the German Federal
Finance Agency sold a 30-year zero coupon bond (i.e. it pays no interest) but
because the bond was sold at 3.61% above par (i.e. investors pay 103.61 but
receive only 100 at maturity) this amounts to a negative interest rate of 0.11%
per annum if the bond is held to maturity. Demand fell short of target, with
sales of €824 million versus a target of €2 billion, but it was generally
perceived as a useful trial of the extent to which the market was prepared to
accept low rates.
In 2017, before yields fell to current levels, two countries
– Austria and Argentina – decided to test the demand for ultra-long issuance by
selling 100 year bonds. Their experience has been rather different, with the
price of the long-term Argentinean bond since halving in value whereas the
Austrian bond has doubled. It is understandable that Argentina tried to
lengthen the maturity of its debt profile – it has been a serial debt defaulter
over the last 70 years with five episodes of default or rescheduling since
1950, so it made sense to reduce disruptions caused by debt rollovers. But this
history also weighs on investors. Can Argentina really be trusted not to default
on its debt in the next 100 years? In order to get investors onboard, Argentina
had to issue at a coupon rate of 7.9%. That might seem high in the context of
the US or Europe, but with the central bank benchmark rate at 74.98% and
10-year yields currently trading at almost 28%, it does not sound quite so bad.
One country which could conceivably get away with issuing longer dated bonds at low coupons is the US where the Treasury, which only issues as far ahead as 30 years, is mulling the possibility
of going even further out along the curve to maturities of 50 and even 100
years. Treasury Secretary Steven Mnuchin said last month that “we are looking at potentially extending the
portfolio. If there is proper demand, we will issue 50-year bonds.” He went
on to suggest that if these bonds prove to be a success, the US would consider
the possibility of 100-year bonds. Historically, the US has issued debt at
longer maturities and between 1955 and 1963, it sold bonds at maturities up to
40 years (here).
In 1911, it even issued a 50 year note to fund the construction of the Panama
Canal.
But as attractive as long-term issuance sounds, there are a
number of factors to consider. History cautions that issuers have to strike a
balance between offering yields which are sufficiently attractive to investors but
which minimise the costs to the issuer, and as the US found in the 1950s and
1960s that is a difficult balance to get right. One of the reasons for sticking
to the current maturity schedule is that the US Treasury has tried to avoid tactical
or opportunistic offerings of debt, and has focused instead on maintaining a
regular and predictable schedule. This has helped the US Treasury market to
become amongst the most liquid financial markets in the world. This in turn allows
the government to offer relatively low coupons in return for the privilege of
liquidity and helps to keep down Federal debt servicing costs. Issuing
ultra-long debt threatens to reduce market liquidity which might in the
long-run push up US rates.
Odd as it may sound, almost 20 years ago there were fears that
rapid US growth and declining budget deficits would lead to a shortage of
Treasury securities. Obviously that never happened, but in a world where there
is a move to increasing the duration of debt we could get to a situation where
there are temporary issuance droughts which could distort the shape of the
yield curve. If there is an increase in the proportion of debt issued at longer
maturities, a prolonged period of reduced issuance – perhaps because of rapid
growth and smaller fiscal deficits – could mean a shortage of supply at the
short end of the curve which would push down yields (i.e. raise prices) and
result in a significant steepening of the yield curve. The point may be
hypothetical but it demonstrates that changing the duration of debt issuance
could have significant market consequences.